webapp/src/components/Feed/Sidebar/Sidebar.module.scss

.sidebar {
  max-height: calc(100vh - 120px);
  overflow: auto;
  position: sticky;
  top: 120px;

  ul > li {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .sidebarItemName {
    margin-right: 0.5em;
    position: relative;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .counter {
    @include font-size(1.2rem);

    align-items: center;
    align-self: flex-start;
    background: #f6f6f6;
    border-radius: 0.8rem;
    display: inline-flex;
    font-weight: bold;
    justify-content: center;
    min-width: 2em;
    margin-left: 0.5em;
    padding: 0.25em 0.5em 0.15em;
    transition: background-color 0.2s;
  }

  .unread {
    position: relative;

    &::after {
      background: #2638d9;
      border-radius: 100%;
      content: '';
      display: inline-block;
      height: 0.5em;
      left: 100%;
      margin-left: 0.3em;
      position: absolute;
      top: 0.5em;
      width: 0.5em;
    }
  }

  .settings {
    display: flex;
    justify-content: space-between;
    margin: 2em 0;
  }

  a {
    img {
      transition: filter 0.3s;
    }

    &:hover {
      img {
        filter: invert(1);
      }

      .counter {
        background: #000;
      }
    }
  }

  .icon {
    display: inline-block;
    line-height: 1;
    height: 2rem;
    margin-right: 0.5em;
    vertical-align: middle;
    width: 2.2rem;

    img {
      height: 100%;
      object-fit: contain;
      object-position: center;
      width: 100%;
    }
  }

  h4 {
    color: #9fa1a7;
    cursor: pointer;
    @include font-size(1.2rem);
    letter-spacing: 0.05em;
    text-transform: uppercase;
    position: relative;

    &:after {
      content: '+';
      font-size: 1.6em;
      line-height: 1;
      position: absolute;
      right: 2.5rem;
      top: -0.2em;
      transition: transform 0.3s;
    }

    &.opened {
      &:after {
        right: 0.9rem;
        transform: rotate(45deg);
      }
    }
  }

  .hidden {
    display: none;
  }
}