discourse/app/assets/stylesheets/common/topic-timeline.scss

.timeline-loading {
  width: 900px;
}

.timeline-container {
  box-sizing: border-box;
  z-index: 499;
  margin-left: 757px;

  @media all and (min-width: 1140px) {
    margin-left: 820px;
  }
  @media all and (min-width: 1250px) {
    margin-left: 900px;
  }

  position: fixed;
  -webkit-transform: translate3d(0,0,0);

  &.timeline-docked {
    position: absolute;
  }

  &.timeline-docked-bottom {
    .timeline-footer-controls {
      opacity: 0;
      pointer-events: none;
      cursor: default;
    }
  }

  &.timeline-fullscreen.show {
    max-height: 700px;
    transition: max-height 0.4s ease-out;
    .topic-timeline {
      .timeline-footer-controls {
        display: inherit;
      }
    }
  }

  &.timeline-fullscreen {
    max-height: 0;
    transition: max-height 0.3s ease-in;
    position: fixed;
    margin-left: 0;
    background-color: $secondary;
    bottom: 0;
    left: 0;
    right: 0;
    border-top: 1px solid dark-light-choose(scale-color($primary, $lightness: 90%), scale-color($secondary, $lightness: 90%));
    box-shadow: 0px -2px 4px -1px rgba(0,0,0,.25);
    padding-top: 20px;
    z-index: 100000;
    .back-button {
      display: none;
    }
    .topic-timeline {
      width: 100%;
      table-layout: fixed;
      margin-left: 0;
      margin-right: 0;
      display: table;
      touch-action: none;

      .timeline-date-wrapper {
        float: right;
        text-align: right;
        font-size: 1.1em;
      }
      .post-excerpt {
        max-width: 650px;
        max-height: 155px;
        line-height: 1.4em;
        overflow: hidden;
        word-wrap: break-word;
        text-overflow: ellipsis;
        display: block;
        display: -webkit-box;
        -webkit-line-clamp: 8;
        -webkit-box-orient: vertical;
      }
      .username {
        color: dark-light-choose(scale-color($primary, $lightness: 30%), scale-color($secondary, $lightness: 70%));
        word-wrap: break-word;
        font-weight: bold;
      }
      .title {
        margin-top: 0;
        padding-left: 1em;
        display: table-cell;
        vertical-align: top;
        width: 100%;
        h2 {
          margin-top: 0;
          display: block;
          display: -webkit-box;
          -webkit-line-clamp: 4;
          -webkit-box-orient: vertical;
          max-height: 110px;
          line-height: 1.3em;
          word-wrap: break-word;
          text-overflow: ellipsis;
          overflow: hidden;
          font-size: 1.3em;
        }
        a {
          color: $primary;
        }
      }
      .timeline-last-read {
        right: 0px;
        margin-left: 0;
        i.progress {
          display: none
        }
      }
      .timeline-footer-controls {
        display: none;
        position: absolute;
        bottom: 10px;
        left: 10px;

        .dropdown-menu {
          position: absolute;
          left: 0;
          bottom: 30px;
        }

        button, .btn-group {
          float: none;
          display: inline-block;
          margin-bottom: 0;
          margin-right: 15px;
          position: static;
        }
      }
      .timeline-scrollarea-wrapper {
        display: table-cell;
        padding-bottom: 20px;
        padding-right: 1.5em;
        width: 100px;
      }
      .timeline-scrollarea {
        border-left: 0;
        border-right-style: solid;
        border-right-width: 1px;
        max-width: 120px;
        float: right;

        .timeline-scroller {
          position: relative;
          margin-right: -1.5em;
          padding-right: 1.5em;
          justify-content: flex-end;
          .timeline-scroller-content {
            text-align: right;
            padding-left: 0;
            padding-right: 1em;
          }
          .timeline-handle {
            float: none;
            width: 11px;
            position: relative;
            right: -6px;
          }
        }
      }
    }


    .timeline-scrollarea-wrapper::after {
      content: "";
      display: table;
      clear: both;
    }

  }

  &.timeline-fullscreen .topic-timeline .timeline-footer-controls ul.dropdown-menu {
    width: auto;
    min-width: 250px;
    right: auto;
    .desc {
      display: none;
    }
    .title {
      padding-left: 0;
    }
  }

  .topic-timeline {
    margin-left: 3em;
    width: 150px;
    transition: opacity 0.2s ease-in;
    touch-action: none;

    .timeline-controls {
      margin-bottom: 1em;
    }

    .timeline-footer-controls {
      margin-top: 1em;
      line-height: 2.5em;
      transition: opacity 0.2s ease-in;

      button {
        margin-right: 0.5em;
      }

      ul.dropdown-menu {
        right: 0.5em;
        top: auto;
        bottom: 25px;
        left: auto;
      }
    }

    .start-date {
      @include unselectable;
      color: dark-light-choose(scale-color($primary, $lightness: 50%), scale-color($secondary, $lightness: 50%));
    }

    .timeline-scrollarea {
      margin-top: 0.5em;
      margin-left: 0.5em;
      border-left: 1px solid;
      border-color: dark-light-choose(scale-color($tertiary, $lightness: 80%), scale-color($tertiary, $lightness: 20%));
      position: relative;
      -webkit-transform: translate3d(0,0,0);
    }

    .timeline-padding {
      transition: height 0.15s ease-out;
      cursor: pointer;
      .widget-dragging & {
        transition: none;
      }
    }

    .timeline-handle {
      @include border-radius-all(0.8em);
      width: 0.35em;
      background-color: dark-light-choose(scale-color($tertiary, $lightness: 80%), scale-color($tertiary, $lightness: 20%));
      height: 100%;
      float: left;
    }

    .timeline-scroller-content {
      padding-left: 1em;
    }

    .timeline-ago {
      color: dark-light-choose(scale-color($primary, $lightness: 50%), scale-color($secondary, $lightness: 50%));
    }

    .timeline-scroller {
      @include unselectable;
      margin-left: -0.19em;
      cursor: ns-resize;
      display: flex;
      align-items: center;

      .back-button {
        margin-top: 1em;
      }
    }

    .timeline-replies {
      font-weight: bold;
    }

    .timeline-last-read {
      position: absolute;
      margin-left: -0.35em;

      i.progress {
        font-size: 0.8em;
        color: $tertiary;
        margin-right: 1em;
      }
    }

    .back-button {
      padding: 2px 5px;
    }

    .now-date {
      @include unselectable;
      display: inline-block;
      color: dark-light-choose(scale-color($primary, $lightness: 50%), scale-color($secondary, $lightness: 50%));
      margin-top: 0.5em;
      i {
        margin-left: 0.15em;
      }
    }
  }
}