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diff --git a/alphabetlearning/static/scss/mixins/_forms.scss b/alphabetlearning/static/scss/mixins/_forms.scss
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+// This mixin uses an `if()` technique to be compatible with Dart Sass
+// See https://github.com/sass/sass/issues/1873#issuecomment-152293725 for more details
+
+// scss-docs-start form-validation-mixins
+@mixin form-validation-state-selector($state) {
+  @if ($state == "valid" or $state == "invalid") {
+    .was-validated #{if(&, "&", "")}:#{$state},
+    #{if(&, "&", "")}.is-#{$state} {
+      @content;
+    }
+  } @else {
+    #{if(&, "&", "")}.is-#{$state} {
+      @content;
+    }
+  }
+}
+
+@mixin form-validation-state(
+  $state,
+  $color,
+  $icon,
+  $tooltip-color: color-contrast($color),
+  $tooltip-bg-color: rgba($color, $form-feedback-tooltip-opacity),
+  $focus-box-shadow: 0 0 $input-btn-focus-blur $input-focus-width rgba($color, $input-btn-focus-color-opacity),
+  $border-color: $color
+) {
+  .#{$state}-feedback {
+    display: none;
+    width: 100%;
+    margin-top: $form-feedback-margin-top;
+    @include font-size($form-feedback-font-size);
+    font-style: $form-feedback-font-style;
+    color: $color;
+  }
+
+  .#{$state}-tooltip {
+    position: absolute;
+    top: 100%;
+    z-index: 5;
+    display: none;
+    max-width: 100%; // Contain to parent when possible
+    padding: $form-feedback-tooltip-padding-y $form-feedback-tooltip-padding-x;
+    margin-top: .1rem;
+    @include font-size($form-feedback-tooltip-font-size);
+    line-height: $form-feedback-tooltip-line-height;
+    color: $tooltip-color;
+    background-color: $tooltip-bg-color;
+    @include border-radius($form-feedback-tooltip-border-radius);
+  }
+
+  @include form-validation-state-selector($state) {
+    ~ .#{$state}-feedback,
+    ~ .#{$state}-tooltip {
+      display: block;
+    }
+  }
+
+  .form-control {
+    @include form-validation-state-selector($state) {
+      border-color: $border-color;
+
+      @if $enable-validation-icons {
+        padding-right: $input-height-inner;
+        background-image: escape-svg($icon);
+        background-repeat: no-repeat;
+        background-position: right $input-height-inner-quarter center;
+        background-size: $input-height-inner-half $input-height-inner-half;
+      }
+
+      &:focus {
+        border-color: $border-color;
+        @if $enable-shadows {
+          @include box-shadow($input-box-shadow, $focus-box-shadow);
+        } @else {
+          // Avoid using mixin so we can pass custom focus shadow properly
+          box-shadow: $focus-box-shadow;
+        }
+      }
+    }
+  }
+
+  // stylelint-disable-next-line selector-no-qualifying-type
+  textarea.form-control {
+    @include form-validation-state-selector($state) {
+      @if $enable-validation-icons {
+        padding-right: $input-height-inner;
+        background-position: top $input-height-inner-quarter right $input-height-inner-quarter;
+      }
+    }
+  }
+
+  .form-select {
+    @include form-validation-state-selector($state) {
+      border-color: $border-color;
+
+      @if $enable-validation-icons {
+        &:not([multiple]):not([size]),
+        &:not([multiple])[size="1"] {
+          --#{$prefix}form-select-bg-icon: #{escape-svg($icon)};
+          padding-right: $form-select-feedback-icon-padding-end;
+          background-position: $form-select-bg-position, $form-select-feedback-icon-position;
+          background-size: $form-select-bg-size, $form-select-feedback-icon-size;
+        }
+      }
+
+      &:focus {
+        border-color: $border-color;
+        @if $enable-shadows {
+          @include box-shadow($form-select-box-shadow, $focus-box-shadow);
+        } @else {
+          // Avoid using mixin so we can pass custom focus shadow properly
+          box-shadow: $focus-box-shadow;
+        }
+      }
+    }
+  }
+
+  .form-control-color {
+    @include form-validation-state-selector($state) {
+      @if $enable-validation-icons {
+        width: add($form-color-width, $input-height-inner);
+      }
+    }
+  }
+
+  .form-check-input {
+    @include form-validation-state-selector($state) {
+      border-color: $border-color;
+
+      &:checked {
+        background-color: $color;
+      }
+
+      &:focus {
+        box-shadow: $focus-box-shadow;
+      }
+
+      ~ .form-check-label {
+        color: $color;
+      }
+    }
+  }
+  .form-check-inline .form-check-input {
+    ~ .#{$state}-feedback {
+      margin-left: .5em;
+    }
+  }
+
+  .input-group {
+    > .form-control:not(:focus),
+    > .form-select:not(:focus),
+    > .form-floating:not(:focus-within) {
+      @include form-validation-state-selector($state) {
+        @if $state == "valid" {
+          z-index: 3;
+        } @else if $state == "invalid" {
+          z-index: 4;
+        }
+      }
+    }
+  }
+}
+// scss-docs-end form-validation-mixins