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diff --git a/templates/assets/bootstrap/scss/mixins/_forms.scss b/templates/assets/bootstrap/scss/mixins/_forms.scss
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+++ b/templates/assets/bootstrap/scss/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
+  .form-control-feedback,
+  .form-control-label,
+  .col-form-label,
+  .form-check-label,
+  .custom-control {
+    color: $color;
+  }
+
+  // Set the border and box shadow on specific inputs to match
+  .form-control,
+  .custom-select,
+  .custom-file-control {
+    border-color: $color;
+
+    &:focus {
+      @include box-shadow($input-box-shadow, 0 0 6px lighten($color, 20%));
+    }
+  }
+
+  // Set validation states also for addons
+  .input-group-addon {
+    color: $color;
+    background-color: lighten($color, 40%);
+    border-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 {
+    color: $input-color-focus;
+    background-color: $input-bg-focus;
+    border-color: $input-border-focus;
+    outline: none;
+    @include box-shadow($input-box-shadow-focus);
+  }
+}