Multi-Factor Auth with OTP

app/styles/about.scss

@@ -34,6 +34,7 @@ $small-breakpoint: 960px;
     flex-wrap: nowrap;
     padding: 14px 0;
     box-sizing: border-box;
+    position: relative;
 
     @media screen and (max-width: 1024px) {
       padding: 14px 20px;
@@ -1712,7 +1713,40 @@ $small-breakpoint: 960px;
   .header,
   .container {
     position: relative;
-    z-index: 1;
+  }
+
+  .otp-form-overlay__container {
+    z-index: 9998;
+    position: fixed;
+    top: 0;
+    left: 0;
+    right: 0;
+    bottom: 0;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    background: rgba($base-overlay-background, 0.7);
+
+    .otp-form-overlay__form {
+      @include standard-panel-shadow;
+      border-radius: 10px;
+      z-index: 9999;
+      margin: 0 auto;
+      max-width: 800px;
+      position: relative;
+      padding: 20px;
+      background-color: var(--background-color);
+      display: flex;
+      flex-direction: column;
+
+      .simple_form {
+        padding: 30px 50px 50px;
+      }
+
+      .otp-form-overlay__close {
+        align-self: flex-end;
+      }
+    }
   }
 }
 
@@ -1725,3 +1759,10 @@ $small-breakpoint: 960px;
   bottom: 0;
   right: 0;
 }
+
+h1.otp-login {
+  font-size: 16px;
+  line-height: 24px;
+  font-weight: 800;
+  padding: 10px 0;
+}

app/styles/application.scss

@@ -72,3 +72,4 @@
 @import 'components/video-player';
 @import 'components/audio-player';
 @import 'components/profile_hover_card';
+@import 'components/mfa_form';

app/styles/components/buttons.scss

@@ -102,7 +102,7 @@ button {
     &:focus,
     &:hover {
       border-color: var(--brand-color);
-      color: var(--primary-text-color);
+      color: var(--background-color);
     }
 
     &:disabled {

app/styles/components/mfa_form.scss

@@ -0,0 +1,81 @@
+.security-settings-panel {
+  margin: 20px;
+
+  h1.security-settings-panel__setup-otp {
+    font-size: 20px;
+    line-height: 1.25;
+    color: var(--primary-text-color);
+    font-weight: 600;
+  }
+
+  h2.security-settings-panel__setup-otp {
+      display: block;
+      font-size: 16px;
+      line-height: 1.5;
+      color: var(--primary-text-color--faint);
+      font-weight: 400;
+    }
+
+  div {
+    display: block;
+    margin: 10px 0;
+  }
+
+  .security-warning {
+    color: var(--primary-text-color);
+    padding: 15px 20px;
+    font-size: 14px;
+    background-color: var(--warning-color--faint);
+    margin: 5px 20px;
+    border-radius: 8px;
+    margin: 20px auto;
+  }
+
+  .backup_codes {
+    margin: 20px;
+    font-weight: bold;
+    padding: 15px 20px;
+    font-size: 14px;
+    background-color: var(--brand-color--faint);
+    border-radius: 8px;
+    margin: 20px;
+    text-align: center;
+    position: relative;
+    min-height: 125px;
+
+    .backup_code {
+      margin: 5px auto;
+    }
+
+    .loading-indicator {
+      position: absolute;
+    }
+  }
+
+  .security-settings-panel__setup-otp__buttons {
+    margin: 20px;
+    display: flex;
+    justify-content: space-between;
+
+    .button {
+      min-width: 182px;
+    }
+  }
+
+  div.confirm-key {
+    display: block;
+    font-size: 16px;
+    line-height: 1.5;
+    color: var(--primary-text-color--faint);
+    font-weight: 400;
+    margin: 0 0 20px 20px;
+  }
+}
+
+form.otp-auth {
+  .error-box {
+    width: 100%;
+    text-align: center;
+    color: $error-red;
+  }
+}

app/styles/components/tabs-bar.scss

@@ -255,9 +255,9 @@
     display: block;
     margin-right: 30px;
     border: 0;
-    height: 50px;
+    height: 40px;
     overflow: hidden;
-    padding: 10px 0;
+    padding: 13px 0 0;
     box-sizing: border-box;
     filter: brightness(0%) grayscale(100%) invert(100%);
     & span {display: none !important;}

app/styles/themes.scss

@@ -30,12 +30,14 @@ body {
   --accent-color: hsl(var(--accent-color_hsl));
   --primary-text-color: hsl(var(--primary-text-color_hsl));
   --background-color: hsl(var(--background-color_hsl));
+  --warning-color: hsla(var(--warning-color_hsl));
 
   // Meta-variables
   --brand-color_hsl: var(--brand-color_h), var(--brand-color_s), var(--brand-color_l);
   --accent-color_hsl: var(--accent-color_h), var(--accent-color_s), var(--accent-color_l);
   --primary-text-color_hsl: var(--primary-text-color_h), var(--primary-text-color_s), var(--primary-text-color_l);
   --background-color_hsl: var(--background-color_h), var(--background-color_s), var(--background-color_l);
+  --warning-color_hsl: var(--warning-color_h), var(--warning-color_s), var(--warning-color_l);
   --accent-color_h: calc(var(--brand-color_h) - 15);
   --accent-color_s: 86%;
   --accent-color_l: 44%;
@@ -51,6 +53,7 @@ body {
     calc(var(--accent-color_l) + 3%)
   );
   --primary-text-color--faint: hsla(var(--primary-text-color_hsl), 0.6);
+  --warning-color--faint: hsla(var(--warning-color_hsl), 0.5);
 }
 
 body.theme-mode-light {
@@ -69,6 +72,9 @@ body.theme-mode-light {
   --background-color_h: 0;
   --background-color_s: 0%;
   --background-color_l: 94.9%;
+  --warning-color_h: 0;
+  --warning-color_s: 100%;
+  --warning-color_l: 66%;
 
   // Modifiers
   --brand-color--hicontrast: hsl(
@@ -94,6 +100,9 @@ body.theme-mode-dark {
   --background-color_h: 0;
   --background-color_s: 0%;
   --background-color_l: 20%;
+  --warning-color_h: 0;
+  --warning-color_s: 100%;
+  --warning-color_l: 66%;
 
   // Modifiers
   --brand-color--hicontrast: hsl(