dc-sdk/modules/themes/slider.scss

.dc-slider {
  position: absolute;
  left: 50%;
  top: 0px;
  background-color: #d3d3d3;
  width: 5px;
  height: 100%;
  z-index: 9999;
  .splitter {
    position: absolute;
    left: -21px;
    top: calc(50% - 21px);
    width: 42px;
    height: 42px;
    background: #fff;
    border-radius: 50%;
    text-align: center;
    line-height: 58px;
    padding: 2px;
    border: 1px solid lightgrey;
    &:hover {
      cursor: ew-resize;
    }
  }
}