diff --git a/src/bootstrap/__tests__/__snapshots__/CheckBox.test.js.snap b/src/bootstrap/__tests__/__snapshots__/CheckBox.test.js.snap
index 89be1f4..c900495 100644
--- a/src/bootstrap/__tests__/__snapshots__/CheckBox.test.js.snap
+++ b/src/bootstrap/__tests__/__snapshots__/CheckBox.test.js.snap
@@ -2,55 +2,51 @@
 
 exports[`<Checkbox/> Render checkbox 1`] = `
 <div
-  class="form-group"
+  class="mb-3 form-check"
 >
-  <div
-    class="custom-control custom-checkbox "
+  <input
+    checked=""
+    class="form-check-input"
+    id="1"
+    type="checkbox"
+  />
+  <label
+    class="form-check-label"
+    for="1"
   >
-    <input
-      checked=""
-      class="custom-control-input"
-      id="1"
-      type="checkbox"
-    />
-    <label
-      class="custom-control-label"
-      for="1"
-    >
-      Test label
-      <small
-        class="form-text text-muted"
-      >
-        Some help text
-      </small>
-    </label>
+    Test label
+  </label>
+  <div
+    class="form-text"
+  >
+    <small>
+      Some help text
+    </small>
   </div>
 </div>
 `;
 
 exports[`<Checkbox/> Render uncheked checkbox 1`] = `
 <div
-  class="form-group"
+  class="mb-3 form-check"
 >
-  <div
-    class="custom-control custom-checkbox "
+  <input
+    class="form-check-input"
+    id="1"
+    type="checkbox"
+  />
+  <label
+    class="form-check-label"
+    for="1"
   >
-    <input
-      class="custom-control-input"
-      id="1"
-      type="checkbox"
-    />
-    <label
-      class="custom-control-label"
-      for="1"
-    >
-      Test label
-      <small
-        class="form-text text-muted"
-      >
-        Some help text
-      </small>
-    </label>
+    Test label
+  </label>
+  <div
+    class="form-text"
+  >
+    <small>
+      Some help text
+    </small>
   </div>
 </div>
 `;
diff --git a/src/bootstrap/__tests__/__snapshots__/NumberInput.test.js.snap b/src/bootstrap/__tests__/__snapshots__/NumberInput.test.js.snap
index 2ac7802..6fceddc 100644
--- a/src/bootstrap/__tests__/__snapshots__/NumberInput.test.js.snap
+++ b/src/bootstrap/__tests__/__snapshots__/NumberInput.test.js.snap
@@ -2,9 +2,10 @@
 
 exports[`<NumberInput/> Render number input 1`] = `
 <div
-  class="form-group"
+  class="mb-3"
 >
   <label
+    class="form-label"
     for="1"
   >
     Test label
@@ -18,33 +19,31 @@ exports[`<NumberInput/> Render number input 1`] = `
       type="number"
       value="1"
     />
-    <div
-      class="input-group-append"
+    <button
+      aria-label="Increase"
+      class="btn btn-outline-secondary"
+      type="button"
     >
-      <button
-        aria-label="Increase"
-        class="btn btn-outline-secondary"
-        type="button"
-      >
-        <i
-          class="fas fa-plus"
-        />
-      </button>
-      <button
-        aria-label="Decrease"
-        class="btn btn-outline-secondary"
-        type="button"
-      >
-        <i
-          class="fas fa-minus"
-        />
-      </button>
-    </div>
+      <i
+        class="fas fa-plus"
+      />
+    </button>
+    <button
+      aria-label="Decrease"
+      class="btn btn-outline-secondary"
+      type="button"
+    >
+      <i
+        class="fas fa-minus"
+      />
+    </button>
   </div>
-  <small
-    class="form-text text-muted"
+  <div
+    class="form-text"
   >
-    Some help text
-  </small>
+    <small>
+      Some help text
+    </small>
+  </div>
 </div>
 `;
diff --git a/src/bootstrap/__tests__/__snapshots__/PasswordInput.test.js.snap b/src/bootstrap/__tests__/__snapshots__/PasswordInput.test.js.snap
index 0bbe9ea..58a9e4b 100644
--- a/src/bootstrap/__tests__/__snapshots__/PasswordInput.test.js.snap
+++ b/src/bootstrap/__tests__/__snapshots__/PasswordInput.test.js.snap
@@ -2,9 +2,10 @@
 
 exports[`<PasswordInput/> Render password input 1`] = `
 <div
-  class="form-group"
+  class="mb-3"
 >
   <label
+    class="form-label"
     for="1"
   >
     Test label
@@ -20,10 +21,12 @@ exports[`<PasswordInput/> Render password input 1`] = `
       value="Some password"
     />
   </div>
-  <small
-    class="form-text text-muted"
+  <div
+    class="form-text"
   >
-    Some help text
-  </small>
+    <small>
+      Some help text
+    </small>
+  </div>
 </div>
 `;
diff --git a/src/bootstrap/__tests__/__snapshots__/RadioSet.test.js.snap b/src/bootstrap/__tests__/__snapshots__/RadioSet.test.js.snap
index 9a57656..84db55e 100644
--- a/src/bootstrap/__tests__/__snapshots__/RadioSet.test.js.snap
+++ b/src/bootstrap/__tests__/__snapshots__/RadioSet.test.js.snap
@@ -2,7 +2,7 @@
 
 exports[`<RadioSet/> Render radio set 1`] = `
 <div
-  class="form-group"
+  class="mb-3"
 >
   <label
     class="d-block"
@@ -11,61 +11,63 @@ exports[`<RadioSet/> Render radio set 1`] = `
     Radios set label
   </label>
   <div
-    class="custom-control custom-radio"
+    class="mb-2"
   >
     <input
       checked=""
-      class="custom-control-input"
+      class="form-check-input me-2"
       id="test_name-0"
       name="test_name"
       type="radio"
       value="value"
     />
     <label
-      class="custom-control-label"
+      class="form-check-label"
       for="test_name-0"
     >
       label
     </label>
   </div>
   <div
-    class="custom-control custom-radio"
+    class="mb-2"
   >
     <input
-      class="custom-control-input"
+      class="form-check-input me-2"
       id="test_name-1"
       name="test_name"
       type="radio"
       value="another value"
     />
     <label
-      class="custom-control-label"
+      class="form-check-label"
       for="test_name-1"
     >
       another label
     </label>
   </div>
   <div
-    class="custom-control custom-radio"
+    class="mb-2"
   >
     <input
-      class="custom-control-input"
+      class="form-check-input me-2"
       id="test_name-2"
       name="test_name"
       type="radio"
       value="another on value"
     />
     <label
-      class="custom-control-label"
+      class="form-check-label"
       for="test_name-2"
     >
       another one  label
     </label>
   </div>
-  <small
-    class="form-text text-muted"
+  <div
+    class="form-text"
   >
-    Some help text
-  </small>
+    <small>
+      Some help text
+    </small>
+  </div>
 </div>
 `;
diff --git a/src/bootstrap/__tests__/__snapshots__/Select.test.js.snap b/src/bootstrap/__tests__/__snapshots__/Select.test.js.snap
index d907571..78422b6 100644
--- a/src/bootstrap/__tests__/__snapshots__/Select.test.js.snap
+++ b/src/bootstrap/__tests__/__snapshots__/Select.test.js.snap
@@ -3,15 +3,16 @@
 exports[`<Select/> Test with snapshot. 1`] = `
 <div>
   <div
-    class="form-group"
+    class="mb-3"
   >
     <label
+      class="form-label"
       for="1"
     >
       Test label
     </label>
     <select
-      class="custom-select"
+      class="form-select"
       id="1"
     >
       <option
@@ -30,11 +31,13 @@ exports[`<Select/> Test with snapshot. 1`] = `
         three
       </option>
     </select>
-    <small
-      class="form-text text-muted"
+    <div
+      class="form-text"
     >
-      Help text
-    </small>
+      <small>
+        Help text
+      </small>
+    </div>
   </div>
 </div>
 `;
diff --git a/src/bootstrap/__tests__/__snapshots__/Switch.test.js.snap b/src/bootstrap/__tests__/__snapshots__/Switch.test.js.snap
index cc5f8c9..c962d21 100644
--- a/src/bootstrap/__tests__/__snapshots__/Switch.test.js.snap
+++ b/src/bootstrap/__tests__/__snapshots__/Switch.test.js.snap
@@ -2,26 +2,25 @@
 
 exports[`<Switch/> Render switch 1`] = `
 <div
-  class="form-group"
+  class="form-check form-switch mb-3 null"
 >
-  <div
-    class="custom-control custom-switch"
+  <input
+    checked=""
+    class="form-check-input"
+    id="1"
+    role="switch"
+    type="checkbox"
+  />
+  <label
+    class="form-check-label"
+    for="1"
   >
-    <input
-      checked=""
-      class="custom-control-input"
-      id="1"
-      type="checkbox"
-    />
-    <label
-      class="custom-control-label"
-      for="1"
-    >
-      Test label
-    </label>
-    <small
-      class="form-text text-muted mt-0 mb-3"
-    >
+    Test label
+  </label>
+  <div
+    class="form-text"
+  >
+    <small>
       Some help text
     </small>
   </div>
@@ -30,25 +29,24 @@ exports[`<Switch/> Render switch 1`] = `
 
 exports[`<Switch/> Render uncheked switch 1`] = `
 <div
-  class="form-group"
+  class="form-check form-switch mb-3 null"
 >
-  <div
-    class="custom-control custom-switch"
+  <input
+    class="form-check-input"
+    id="1"
+    role="switch"
+    type="checkbox"
+  />
+  <label
+    class="form-check-label"
+    for="1"
   >
-    <input
-      class="custom-control-input"
-      id="1"
-      type="checkbox"
-    />
-    <label
-      class="custom-control-label"
-      for="1"
-    >
-      Test label
-    </label>
-    <small
-      class="form-text text-muted mt-0 mb-3"
-    >
+    Test label
+  </label>
+  <div
+    class="form-text"
+  >
+    <small>
       Some help text
     </small>
   </div>
diff --git a/src/bootstrap/__tests__/__snapshots__/TextInput.test.js.snap b/src/bootstrap/__tests__/__snapshots__/TextInput.test.js.snap
index 3dd5c56..52adab8 100644
--- a/src/bootstrap/__tests__/__snapshots__/TextInput.test.js.snap
+++ b/src/bootstrap/__tests__/__snapshots__/TextInput.test.js.snap
@@ -2,9 +2,10 @@
 
 exports[`<TextInput/> Render text input 1`] = `
 <div
-  class="form-group"
+  class="mb-3"
 >
   <label
+    class="form-label"
     for="1"
   >
     Test label
@@ -19,10 +20,12 @@ exports[`<TextInput/> Render text input 1`] = `
       value="Some text"
     />
   </div>
-  <small
-    class="form-text text-muted"
+  <div
+    class="form-text"
   >
-    Some help text
-  </small>
+    <small>
+      Some help text
+    </small>
+  </div>
 </div>
 `;
diff --git a/src/common/WiFiSettings/__tests__/__snapshots__/WiFiSettings.test.js.snap b/src/common/WiFiSettings/__tests__/__snapshots__/WiFiSettings.test.js.snap
index 84df914..61083f3 100644
--- a/src/common/WiFiSettings/__tests__/__snapshots__/WiFiSettings.test.js.snap
+++ b/src/common/WiFiSettings/__tests__/__snapshots__/WiFiSettings.test.js.snap
@@ -5,7 +5,7 @@ exports[`<WiFiSettings/> Snapshot 2.4 GHz 1`] = `
 - First value
 + Second value
 
-@@ -241,207 +241,95 @@
+@@ -243,207 +243,95 @@
               value=\\"0\\"
             >
               auto
@@ -255,53 +255,51 @@ exports[`<WiFiSettings/> Snapshot both modules disabled. 1`] = `
   >
     <form>
       <div
-        class="form-group switch"
+        class="form-check form-switch mb-3 d-flex align-items-center"
       >
-        <div
-          class="custom-control custom-switch custom-control-inline switch-heading"
+        <input
+          class="form-check-input me-2"
+          id="1"
+          role="switch"
+          type="checkbox"
+        />
+        <label
+          class="form-check-label"
+          for="1"
         >
-          <input
-            class="custom-control-input"
-            id="1"
-            type="checkbox"
-          />
-          <label
-            class="custom-control-label"
-            for="1"
+          <h2
+            class="mb-0"
           >
-            <h2>
-              Wi-Fi 1
-            </h2>
-          </label>
-        </div>
+            Wi-Fi 1
+          </h2>
+        </label>
       </div>
       <hr />
       <div
-        class="form-group switch"
+        class="form-check form-switch mb-3 d-flex align-items-center"
       >
-        <div
-          class="custom-control custom-switch custom-control-inline switch-heading"
+        <input
+          class="form-check-input me-2"
+          id="2"
+          role="switch"
+          type="checkbox"
+        />
+        <label
+          class="form-check-label"
+          for="2"
         >
-          <input
-            class="custom-control-input"
-            id="2"
-            type="checkbox"
-          />
-          <label
-            class="custom-control-label"
-            for="2"
+          <h2
+            class="mb-0"
           >
-            <h2>
-              Wi-Fi 2
-            </h2>
-          </label>
-        </div>
+            Wi-Fi 2
+          </h2>
+        </label>
       </div>
       <div
         class="text-end"
       >
         <button
-          class="btn btn-primary col-sm-12 col-md-3 col-lg-2 d-inline-flex justify-content-center align-items-center"
+          class="btn btn-primary col-12 col-md-3 col-lg-2 d-inline-flex justify-content-center align-items-center"
           type="submit"
         >
           <span>
@@ -324,7 +322,7 @@ exports[`<WiFiSettings/> Snapshot both modules disabled. 1`] = `
       class="text-end"
     >
       <button
-        class="btn btn-primary col-sm-12 col-md-3 col-lg-2 d-inline-flex justify-content-center align-items-center"
+        class="btn btn-primary col-12 col-md-3 col-lg-2 d-inline-flex justify-content-center align-items-center"
         type="button"
       >
         <span>
@@ -341,16 +339,17 @@ exports[`<WiFiSettings/> Snapshot guest network. 1`] = `
 - First value
 + Second value
 
-@@ -524,10 +524,92 @@
-            >
+@@ -527,10 +527,94 @@
+            <small>
               Enables Wi-Fi for guests, which is separated from LAN network. Devices connected to this network are allowed to access the internet, but aren't allowed to access other devices and the configuration interface of the router. Parameters of the guest network can be set in the Guest network tab.
             </small>
           </div>
         </div>
 +       <div
-+         class=\\"form-group\\"
++         class=\\"mb-3\\"
 +       >
 +         <label
++           class=\\"form-label\\"
 +           for=\\"24\\"
 +         >
 +           SSID
@@ -380,16 +379,19 @@ exports[`<WiFiSettings/> Snapshot guest network. 1`] = `
 +             </button>
 +           </div>
 +         </div>
-+         <small
-+           class=\\"form-text text-muted\\"
++         <div
++           class=\\"form-text\\"
 +         >
-+           SSID which contains non-standard characters could cause problems on some devices.
-+         </small>
++           <small>
++             SSID which contains non-standard characters could cause problems on some devices.
++           </small>
++         </div>
 +       </div>
 +       <div
-+         class=\\"form-group\\"
++         class=\\"mb-3\\"
 +       >
 +         <label
++           class=\\"form-label\\"
 +           for=\\"25\\"
 +         >
 +           Password
@@ -399,47 +401,45 @@ exports[`<WiFiSettings/> Snapshot guest network. 1`] = `
 +         >
 +           <input
 +             autocomplete=\\"current-password\\"
-+             class=\\"form-control  is-invalid\\"
++             class=\\"form-control is-invalid\\"
 +             id=\\"25\\"
 +             required=\\"\\"
 +             type=\\"password\\"
 +             value=\\"\\"
 +           />
-+           <div
-+             class=\\"input-group-append\\"
++           <button
++             class=\\"input-group-text\\"
++             type=\\"button\\"
 +           >
-+             <button
-+               class=\\"input-group-text\\"
-+               type=\\"button\\"
-+             >
-+               <i
-+                 class=\\"fa fa-eye\\"
-+               />
-+             </button>
-+           </div>
++             <i
++               class=\\"fa fa-eye\\"
++             />
++           </button>
 +         </div>
 +         <div
 +           class=\\"invalid-feedback\\"
 +         >
 +           Password must contain at least 8 symbols
 +         </div>
-+         <small
-+           class=\\"form-text text-muted\\"
++         <div
++           class=\\"form-text\\"
 +         >
-+           WPA2/3 pre-shared key, that is required to connect to the network.
-+         </small>
++           <small>
++             WPA2/3 pre-shared key, that is required to connect to the network.
++           </small>
++         </div>
 +       </div>
         <hr />
         <div
-          class=\\"form-group switch\\"
+          class=\\"form-check form-switch mb-3 d-flex align-items-center\\"
         >
-          <div
-@@ -551,10 +633,11 @@
+          <input
+@@ -553,10 +637,11 @@
         <div
           class=\\"text-end\\"
         >
           <button
-            class=\\"btn btn-primary col-sm-12 col-md-3 col-lg-2 d-inline-flex justify-content-center align-items-center\\"
+            class=\\"btn btn-primary col-12 col-md-3 col-lg-2 d-inline-flex justify-content-center align-items-center\\"
 +           disabled=\\"\\"
             type=\\"submit\\"
           >
@@ -453,16 +453,17 @@ exports[`<WiFiSettings/> Snapshot one module enabled. 1`] = `
 - First value
 + Second value
 
-@@ -22,10 +22,512 @@
-                Wi-Fi 1
-              </h2>
-            </label>
-          </div>
+@@ -21,10 +21,516 @@
+            >
+              Wi-Fi 1
+            </h2>
+          </label>
         </div>
 +       <div
-+         class=\\"form-group\\"
++         class=\\"mb-3\\"
 +       >
 +         <label
++           class=\\"form-label\\"
 +           for=\\"4\\"
 +         >
 +           SSID
@@ -477,32 +478,31 @@ exports[`<WiFiSettings/> Snapshot one module enabled. 1`] = `
 +             type=\\"text\\"
 +             value=\\"TestSSID1\\"
 +           />
-+           <div
-+             class=\\"input-group-append\\"
++           <button
++             class=\\"input-group-text\\"
++             type=\\"button\\"
 +           >
-+             <button
-+               class=\\"input-group-text\\"
-+               type=\\"button\\"
-+             >
-+               <img
-+                 alt=\\"QR\\"
-+                 src=\\"/reforis/static/reforis/imgs/QR_icon.svg\\"
-+                 style=\\"opacity: 0.67;\\"
-+                 width=\\"20\\"
-+               />
-+             </button>
-+           </div>
++             <img
++               alt=\\"QR\\"
++               src=\\"/reforis/static/reforis/imgs/QR_icon.svg\\"
++               style=\\"opacity: 0.67;\\"
++               width=\\"20\\"
++             />
++           </button>
 +         </div>
-+         <small
-+           class=\\"form-text text-muted\\"
++         <div
++           class=\\"form-text\\"
 +         >
-+           SSID which contains non-standard characters could cause problems on some devices.
-+         </small>
++           <small>
++             SSID which contains non-standard characters could cause problems on some devices.
++           </small>
++         </div>
 +       </div>
 +       <div
-+         class=\\"form-group\\"
++         class=\\"mb-3\\"
 +       >
 +         <label
++           class=\\"form-label\\"
 +           for=\\"5\\"
 +         >
 +           Password
@@ -518,51 +518,48 @@ exports[`<WiFiSettings/> Snapshot one module enabled. 1`] = `
 +             type=\\"password\\"
 +             value=\\"TestPass\\"
 +           />
-+           <div
-+             class=\\"input-group-append\\"
++           <button
++             class=\\"input-group-text\\"
++             type=\\"button\\"
 +           >
-+             <button
-+               class=\\"input-group-text\\"
-+               type=\\"button\\"
-+             >
-+               <i
-+                 class=\\"fa fa-eye\\"
-+               />
-+             </button>
-+           </div>
++             <i
++               class=\\"fa fa-eye\\"
++             />
++           </button>
 +         </div>
-+         <small
-+           class=\\"form-text text-muted\\"
++         <div
++           class=\\"form-text\\"
 +         >
-+           WPA2/3 pre-shared key, that is required to connect to the network.
-+         </small>
++           <small>
++             WPA2/3 pre-shared key, that is required to connect to the network.
++           </small>
++         </div>
 +       </div>
 +       <div
-+         class=\\"form-group\\"
++         class=\\"form-check form-switch mb-3 null\\"
 +       >
-+         <div
-+           class=\\"custom-control custom-switch\\"
++         <input
++           class=\\"form-check-input\\"
++           id=\\"6\\"
++           role=\\"switch\\"
++           type=\\"checkbox\\"
++         />
++         <label
++           class=\\"form-check-label\\"
++           for=\\"6\\"
 +         >
-+           <input
-+             class=\\"custom-control-input\\"
-+             id=\\"6\\"
-+             type=\\"checkbox\\"
-+           />
-+           <label
-+             class=\\"custom-control-label\\"
-+             for=\\"6\\"
-+           >
-+             Hide SSID
-+           </label>
-+           <small
-+             class=\\"form-text text-muted mt-0 mb-3\\"
-+           >
++           Hide SSID
++         </label>
++         <div
++           class=\\"form-text\\"
++         >
++           <small>
 +             If set, network is not visible when scanning for available networks.
 +           </small>
 +         </div>
 +       </div>
 +       <div
-+         class=\\"form-group\\"
++         class=\\"mb-3\\"
 +       >
 +         <label
 +           class=\\"d-block\\"
@@ -571,56 +568,59 @@ exports[`<WiFiSettings/> Snapshot one module enabled. 1`] = `
 +           GHz
 +         </label>
 +         <div
-+           class=\\"custom-control custom-radio custom-control-inline\\"
++           class=\\"mb-2 form-check form-check-inline\\"
 +         >
 +           <input
-+             class=\\"custom-control-input\\"
++             class=\\"form-check-input me-2\\"
 +             id=\\"hwmode-0-0\\"
 +             name=\\"hwmode-0\\"
 +             type=\\"radio\\"
 +             value=\\"11g\\"
 +           />
 +           <label
-+             class=\\"custom-control-label\\"
++             class=\\"form-check-label\\"
 +             for=\\"hwmode-0-0\\"
 +           >
 +             2.4
 +           </label>
 +         </div>
 +         <div
-+           class=\\"custom-control custom-radio custom-control-inline\\"
++           class=\\"mb-2 form-check form-check-inline\\"
 +         >
 +           <input
 +             checked=\\"\\"
-+             class=\\"custom-control-input\\"
++             class=\\"form-check-input me-2\\"
 +             id=\\"hwmode-0-1\\"
 +             name=\\"hwmode-0\\"
 +             type=\\"radio\\"
 +             value=\\"11a\\"
 +           />
 +           <label
-+             class=\\"custom-control-label\\"
++             class=\\"form-check-label\\"
 +             for=\\"hwmode-0-1\\"
 +           >
 +             5
 +           </label>
 +         </div>
-+         <small
-+           class=\\"form-text text-muted\\"
++         <div
++           class=\\"form-text\\"
 +         >
-+           The 2.4 GHz band is more widely supported by clients, but tends to have more interference. The 5 GHz band is a newer standard and may not be supported by all your devices. It usually has less interference, but the signal does not carry so well indoors.
-+         </small>
++           <small>
++             The 2.4 GHz band is more widely supported by clients, but tends to have more interference. The 5 GHz band is a newer standard and may not be supported by all your devices. It usually has less interference, but the signal does not carry so well indoors.
++           </small>
++         </div>
 +       </div>
 +       <div
-+         class=\\"form-group\\"
++         class=\\"mb-3\\"
 +       >
 +         <label
++           class=\\"form-label\\"
 +           for=\\"8\\"
 +         >
 +           802.11n/ac/ax mode
 +         </label>
 +         <select
-+           class=\\"custom-select\\"
++           class=\\"form-select\\"
 +           id=\\"8\\"
 +         >
 +           <option
@@ -654,22 +654,25 @@ exports[`<WiFiSettings/> Snapshot one module enabled. 1`] = `
 +             802.11ac - 80 MHz wide channel
 +           </option>
 +         </select>
-+         <small
-+           class=\\"form-text text-muted\\"
++         <div
++           class=\\"form-text\\"
 +         >
-+           Change this to adjust 802.11n/ac/ax mode of operation. 802.11n with 40 MHz wide channels can yield higher throughput but can cause more interference in the network. If you don't know what to choose, use the default option with 20 MHz wide channel.
-+         </small>
++           <small>
++             Change this to adjust 802.11n/ac/ax mode of operation. 802.11n with 40 MHz wide channels can yield higher throughput but can cause more interference in the network. If you don't know what to choose, use the default option with 20 MHz wide channel.
++           </small>
++         </div>
 +       </div>
 +       <div
-+         class=\\"form-group\\"
++         class=\\"mb-3\\"
 +       >
 +         <label
++           class=\\"form-label\\"
 +           for=\\"9\\"
 +         >
 +           Channel
 +         </label>
 +         <select
-+           class=\\"custom-select\\"
++           class=\\"form-select\\"
 +           id=\\"9\\"
 +         >
 +           <option
@@ -880,15 +883,16 @@ exports[`<WiFiSettings/> Snapshot one module enabled. 1`] = `
 +         </select>
 +       </div>
 +       <div
-+         class=\\"form-group\\"
++         class=\\"mb-3\\"
 +       >
 +         <label
++           class=\\"form-label\\"
 +           for=\\"10\\"
 +         >
 +           Encryption
 +         </label>
 +         <select
-+           class=\\"custom-select\\"
++           class=\\"form-select\\"
 +           id=\\"10\\"
 +         >
 +           <option
@@ -907,63 +911,63 @@ exports[`<WiFiSettings/> Snapshot one module enabled. 1`] = `
 +             WPA2 only
 +           </option>
 +         </select>
-+         <small
-+           class=\\"form-text text-muted\\"
++         <div
++           class=\\"form-text\\"
 +         >
-+           The WPA3 standard is the new most secure encryption method that is suggested to be used with any device that supports it. The older devices without WPA3 support require older WPA2. If you experience issues with connecting older devices, try to enable WPA2.
-+         </small>
++           <small>
++             The WPA3 standard is the new most secure encryption method that is suggested to be used with any device that supports it. The older devices without WPA3 support require older WPA2. If you experience issues with connecting older devices, try to enable WPA2.
++           </small>
++         </div>
 +       </div>
 +       <div
-+         class=\\"form-group\\"
++         class=\\"form-check form-switch mb-3 null\\"
 +       >
-+         <div
-+           class=\\"custom-control custom-switch\\"
++         <input
++           class=\\"form-check-input\\"
++           id=\\"11\\"
++           role=\\"switch\\"
++           type=\\"checkbox\\"
++         />
++         <label
++           class=\\"form-check-label\\"
++           for=\\"11\\"
 +         >
-+           <input
-+             class=\\"custom-control-input\\"
-+             id=\\"11\\"
-+             type=\\"checkbox\\"
-+           />
-+           <label
-+             class=\\"custom-control-label\\"
-+             for=\\"11\\"
-+           >
-+             Disable Management Frame Protection
-+           </label>
-+           <small
-+             class=\\"form-text text-muted mt-0 mb-3\\"
-+           >
++           Disable Management Frame Protection
++         </label>
++         <div
++           class=\\"form-text\\"
++         >
++           <small>
 +             In case you have trouble connecting to WiFi Access Point, try disabling Management Frame Protection.
 +           </small>
 +         </div>
 +       </div>
 +       <div
-+         class=\\"form-group\\"
++         class=\\"form-check form-switch mb-3 null\\"
 +       >
-+         <div
-+           class=\\"custom-control custom-switch\\"
++         <input
++           class=\\"form-check-input\\"
++           id=\\"12\\"
++           role=\\"switch\\"
++           type=\\"checkbox\\"
++         />
++         <label
++           class=\\"form-check-label\\"
++           for=\\"12\\"
 +         >
-+           <input
-+             class=\\"custom-control-input\\"
-+             id=\\"12\\"
-+             type=\\"checkbox\\"
-+           />
-+           <label
-+             class=\\"custom-control-label\\"
-+             for=\\"12\\"
-+           >
-+             Enable Guest Wi-Fi
-+           </label>
-+           <small
-+             class=\\"form-text text-muted mt-0 mb-3\\"
-+           >
++           Enable Guest Wi-Fi
++         </label>
++         <div
++           class=\\"form-text\\"
++         >
++           <small>
 +             Enables Wi-Fi for guests, which is separated from LAN network. Devices connected to this network are allowed to access the internet, but aren't allowed to access other devices and the configuration interface of the router. Parameters of the guest network can be set in the Guest network tab.
 +           </small>
 +         </div>
 +       </div>
         <hr />
         <div
-          class=\\"form-group switch\\"
+          class=\\"form-check form-switch mb-3 d-flex align-items-center\\"
         >
-          <div"
+          <input"
 `;
diff --git a/src/common/__tests__/__snapshots__/RebootButton.test.js.snap b/src/common/__tests__/__snapshots__/RebootButton.test.js.snap
index 8bddfea..8854d49 100644
--- a/src/common/__tests__/__snapshots__/RebootButton.test.js.snap
+++ b/src/common/__tests__/__snapshots__/RebootButton.test.js.snap
@@ -25,15 +25,10 @@ exports[`<RebootButton/> Render modal. 1`] = `
               Warning!
             </h5>
             <button
-              class="close"
+              aria-label="Close"
+              class="btn-close"
               type="button"
-            >
-              <span
-                aria-hidden="true"
-              >
-                ×
-              </span>
-            </button>
+            />
           </div>
           <div
             class="modal-body"
diff --git a/src/context/alertContext/__tests__/__snapshots__/AlertContext.test.js.snap b/src/context/alertContext/__tests__/__snapshots__/AlertContext.test.js.snap
index 8117aa5..1f826e8 100644
--- a/src/context/alertContext/__tests__/__snapshots__/AlertContext.test.js.snap
+++ b/src/context/alertContext/__tests__/__snapshots__/AlertContext.test.js.snap
@@ -6,14 +6,13 @@ exports[`AlertContext should render alert 1`] = `
     id="alert-container"
   >
     <div
-      class="alert alert-dismissible alert-danger"
+      class="alert alert-danger alert-dismissible"
     >
       <button
-        class="close"
+        aria-label="Close"
+        class="btn-close"
         type="button"
-      >
-        ×
-      </button>
+      />
       Alert content
     </div>
   </div>
diff --git a/src/form/__tests__/__snapshots__/SubmitButton.test.js.snap b/src/form/__tests__/__snapshots__/SubmitButton.test.js.snap
index 956f712..6fb5c8a 100644
--- a/src/form/__tests__/__snapshots__/SubmitButton.test.js.snap
+++ b/src/form/__tests__/__snapshots__/SubmitButton.test.js.snap
@@ -3,7 +3,7 @@
 exports[`<SubmitButton/> Render load 1`] = `
 <div>
   <button
-    class="btn btn-primary col-sm-12 col-md-3 col-lg-2 d-inline-flex justify-content-center align-items-center"
+    class="btn btn-primary col-12 col-md-3 col-lg-2 d-inline-flex justify-content-center align-items-center"
     disabled=""
     type="submit"
   >
@@ -22,7 +22,7 @@ exports[`<SubmitButton/> Render load 1`] = `
 exports[`<SubmitButton/> Render ready 1`] = `
 <div>
   <button
-    class="btn btn-primary col-sm-12 col-md-3 col-lg-2 d-inline-flex justify-content-center align-items-center"
+    class="btn btn-primary col-12 col-md-3 col-lg-2 d-inline-flex justify-content-center align-items-center"
     type="submit"
   >
     <span>
@@ -35,7 +35,7 @@ exports[`<SubmitButton/> Render ready 1`] = `
 exports[`<SubmitButton/> Render saving 1`] = `
 <div>
   <button
-    class="btn btn-primary col-sm-12 col-md-3 col-lg-2 d-inline-flex justify-content-center align-items-center"
+    class="btn btn-primary col-12 col-md-3 col-lg-2 d-inline-flex justify-content-center align-items-center"
     disabled=""
     type="submit"
   >