Below is IPS.cfr.org’s SASS file which compiles into app/css/_timeline.css for which I solo editor. It lives at http://ips.cfr.org/css/_timeline.css which compiles into https://secure.stage.cfr.org/css/screen.css.

app/css/_timeline.css
/**
 * Timeline Components
 */
  .timeline-component{
    padding-bottom:0!important;
    position: relative;
  }

  .timeline-component .slider-item-component .slider-item-wrapper{
    padding:50px 0.25px 20px;
    -moz-box-sizing: border-box;
    box-sizing: border-box;
  }

  .timeline-component .slider-component.small .slider-item-wrapper.with-background-image {
    padding: 40px 0.25px 25px;
  }

  .plots{
    border-bottom: 1px solid #fff;
  }
  .plot, .timeline-wrap .plots .plot.primary{
    background-color: #ccc !important;
  }

  .timeline-point-line.active{
    width:4px;
    margin-left: -2px;
    background-color: #b94619;
    box-shadow: 0px 0px 7px rgba(0, 0, 0, 0.3);
    border-left:0;
    z-index:22;
  }

  .ranges{
    border:0;
    background-color: transparent!important;
    bottom: -5px!important;
  }

  .ranges .point-range{
    padding: 4px;
    border: 2px solid #ccc;
    background: #fff;
    border-radius: 10px;
    margin-left:-6px;
  }

  .ranges .point-range.active{
    background-color: #b94619;
    border: 2px solid #ccc;
  }

  .timeline-viewport{
    border-top: 1px solid #aaa;
    cursor: move;
  }

  .timeline-wrap{
    border:0;
    min-height: 0;
  }

  .timeline-holder {
    margin-top: 1px;
  }

  .active-line{
    display:none;
  }

  .timeline-point{
    z-index: 20;
    padding:0;
    width:200px;
  }
  .timeline-point:hover{
    z-index:22;
  }
  .timeline-point .point-content{
    padding:5px;
    background-color:#fff;
    position:relative;
    z-index: 20;
    padding: 5px 10px;
    min-height: 40px;
  }
  .timeline-point .point-content:hover{
    z-index: 999;
  }
  .timeline-point .point-content .thumbnail {
    margin-right:5px;
  }

  .timeline-point .point-content h3{
    font-size:11px;
    text-shadow:none;
    margin-bottom: 0;
  }

  .point-content .date-label {
    line-height: 12px;
    padding-bottom: 2px;
  }

  .point-content {
    clear:both;
    min-height: 34px;
  }

  .point-content h3 {
    font-size: 14px;
    line-height: 1.25em;
    margin: 0 0 5px;
  }

  .point-content .thumbnail {
    width:40px;
    float:left;
    border-radius: 0;
    border: 0;
    padding: 0;
  }

  .point-content .wrapper {
    float:left;
    padding-left: 10px;
  }

  .point-content .content-wrapper {
    float:left;
  }

  .timeline-point,
  .timeline-point:before{
    box-shadow: 0;
  }

  .timeline-point.active,
  .timeline-point.active:before,
  .timeline-point:hover,
  .timeline-point:hover :before
  {
    box-shadow: 1px 1px 7px rgba(0, 0, 0, 0.7);
    opacity: 1;
    filter:alpha(opacity=100);
  }
  .timeline-point:before,
  .timeline-point:after{
    display:inline-block;
    content:' ';
    text-indent:-1000px;
    overflow:hidden;
    position:absolute;
    bottom:-12px;
    left:-1px;
    z-index: 10
  }
  .timeline-point.active:before{
    width: 1px;
    height: 7px;
    bottom: -10px;
    z-index: -1;
    left: 4px;
    transform: rotate(45deg);
    -ms-transform: rotate(45deg); /* IE 9 */
    -webkit-transform: rotate(45deg); /* Safari and Chrome */
  }
  .timeline-point:after{
    border-color: #fff transparent transparent transparent;
    border-style: solid;
    border-width: 12px 12px 0 0;
    z-index:10;
  }
  .center-marker{
    overflow:hidden;
    width: 31px;
    margin-left:-15px;
    z-index:30;
  }

  .center-marker .triangle{
    display:block;
    zoom:1;
    height:20px;
    width:20px;
    border: 1px solid #aaa;
    background-color: #fff;
    transform: rotate(45deg);
    -ms-transform: rotate(45deg); /* IE 9 */
    -webkit-transform: rotate(45deg); /* Safari and Chrome */
    border-radius:1px;
    top: -15px;
    left: 4px;
    box-shadow: 0px 0px 7px rgba(0, 0, 0, 0.3);
  }

  /* Triangle for IE8 */
  .ie8 .center-marker .triangle {
    border-top: 15px solid #fff;
    border-left: 15px solid transparent;
    border-right: 15px solid transparent;
    position: relative;
    z-index: 2;
    top:-1px;
    height:0;
    width: 0;
    border-bottom:0;
    background:transparent;
  }

  .timeline-container .labels{
    height:25px;
  }
  .labels p{
    line-height: 25px;
  }
  .labels .label{
    text-transform: uppercase;
    font-size: 11px;
    padding:0;
    margin:0;
    color: #888;
    background:transparent;
    border-radius:none;
    font-weight:normal;
    text-shadow:none;
  }

  .timeline-component .embed-dialog .embed-link {
    position: absolute;
    bottom: 23%;
    right: 10px;
  }

  .interactive .overlay-button {
    padding:3px 8px;
    line-height: 11px;
    font-size: 10px;
    border-radius: 8px;
    background-color:rgba(0, 0, 0, 0.65);
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#a6000000', endColorstr='#a6000000',GradientType=0 );
    color:#fff;
    text-shadow:none;
    opacity: 0.85;
    filter:alpha(opacity=85);
    z-index: 20;
  }

  .interactive .overlay-button:hover {
    opacity: 1;
    filter:alpha(opacity=100);
    text-decoration: none;
  }

  .timeline-component .embed-dialog .embed-link i {
    display: none;
  }

/* End Timeline Components */