discourse/app/assets/stylesheets/mobile/components/topic-footer-mobile-dropdown.scss

.topic-footer-mobile-dropdown {
  .select-kit-row {
    .svg-icon-title {
      margin-right: 0.5em;
    }
    &.bookmarked {
      .d-icon {
        color: $tertiary;
      }
    }
  }
}