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diff --git a/src/sass/bootstrap4/mixins/_forms.scss b/src/sass/bootstrap4/mixins/_forms.scss
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+// Form validation states
+//
+// Used in _forms.scss to generate the form validation CSS for warnings, errors,
+// and successes.
+
+@mixin form-control-validation($color) {
+  // Color the label and help text
+  .text-help,
+  .form-control-label,
+  .radio,
+  .checkbox,
+  .radio-inline,
+  .checkbox-inline,
+  &.radio label,
+  &.checkbox label,
+  &.radio-inline label,
+  &.checkbox-inline label  {
+    color: $color;
+  }
+  // Set the border and box shadow on specific inputs to match
+  .form-control {
+    border-color: $color;
+    // @include box-shadow(inset 0 1px 1px rgba(0,0,0,.075)); // Redeclare so transitions work
+
+    &:focus {
+      // border-color: darken($border-color, 10%);
+      // $shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten($border-color, 20%);
+      // @include box-shadow($shadow);
+    }
+  }
+
+  // Set validation states also for addons
+  .input-group-addon {
+    color: $color;
+    border-color: $color;
+    background-color: lighten($color, 40%);
+  }
+  // Optional feedback icon
+  .form-control-feedback {
+    color: $color;
+  }
+}
+
+// Form control focus state
+//
+// Generate a customized focus state and for any input with the specified color,
+// which defaults to the `@input-border-focus` variable.
+//
+// We highly encourage you to not customize the default value, but instead use
+// this to tweak colors on an as-needed basis. This aesthetic change is based on
+// WebKit's default styles, but applicable to a wider range of browsers. Its
+// usability and accessibility should be taken into account with any change.
+//
+// Example usage: change the default blue border and shadow to white for better
+// contrast against a dark gray background.
+@mixin form-control-focus() {
+  &:focus {
+    border-color: $input-border-focus;
+    outline: none;
+    $shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px $input-box-shadow-focus;
+    @include box-shadow($shadow);
+  }
+}
+
+// Form control sizing
+//
+// Relative text size, padding, and border-radii changes for form controls. For
+// horizontal sizing, wrap controls in the predefined grid classes. `<select>`
+// element gets special love because it's special, and that's a fact!
+
+@mixin input-size($parent, $input-height, $padding-vertical, $padding-horizontal, $font-size, $line-height, $border-radius) {
+  #{$parent} {
+    height: $input-height;
+    padding: $padding-vertical $padding-horizontal;
+    font-size: $font-size;
+    line-height: $line-height;
+    @include border-radius($border-radius);
+  }
+
+  select#{$parent} {
+    height: $input-height;
+    line-height: $input-height;
+  }
+
+  textarea#{$parent},
+  select[multiple]#{$parent} {
+    height: auto;
+  }
+}