web/_sass/layout/categories.scss

/*
  Style for Tab Categories
*/

%category-icon-color {
  color: gray;
}

.categories {
  margin-bottom: 2rem;

  .card-header {
    padding-right: 12px;
  }

  i {
    @extend %category-icon-color;

    font-size: 86%; /* fontawesome icons */
  }

  .list-group-item {
    border-left: none;
    border-right: none;
    padding-left: 2rem;

    &:first-child {
      border-top-left-radius: 0;
      border-top-right-radius: 0;
    }
  }
} /* .categories */

.category-trigger {
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  text-align: center;
  color: #6c757d !important;

  i {
    position: relative;
    height: 0.7rem;
    width: 1rem;
    transition: -webkit-transform 300ms ease;
    transition: transform 300ms ease;
    transition: transform 300ms ease, -webkit-transform 300ms ease;
  }

  &:hover {
    i {
      color: var(--categories-icon-hover-color);
    }
  }
}

/* only works on desktop */
@media (hover: hover) {
  .category-trigger:hover {
    background-color: var(--categories-hover-bg);
  }
}

.rotate {
  -webkit-transform: rotate(-90deg);
  transform: rotate(-90deg);
}