gitlab-org--gitlab-foss/app/assets/stylesheets/components/rich_content_editor.scss

/**
* Overrides styles from ToastUI editor
*/

// Toolbar buttons
.tui-editor-defaultUI-toolbar .toolbar-button {
  color: $gl-gray-600;
  border: 0;

  &:hover,
  &:active {
    color: $blue-500;
    border: 0;
  }
}

// Contextual menu's & popups
.tui-editor-defaultUI .tui-popup-wrapper {
  @include gl-overflow-hidden;
  @include gl-rounded-base;
  @include gl-border-gray-400;

  hr {
    @include gl-m-0;
    @include gl-bg-gray-400;
  }

  button {
    @include gl-text-gray-800;
  }
}