.@{prefixClass}-panel-ribbon {
  position: relative;
  height: 100%;
  border-radius: 2px;
  box-shadow: 0 0 2px #808080 inset;
  background-image:
 linear-gradient(
    to right,
    #ff0 0%,
    #f90 10%,
    #cdff00 20%,
    #35ff00 30%,
    #0f6 40%,
    #00fffd 50%,
    #06f 60%,
    #3200ff 70%,
    #cd00ff 80%,
    #f09 90%,
    #f00 100%
  );
  span {
    position: absolute;
    top: 0;
    height: calc(~'100% + 4px');
    width: 6px;
    border-radius: 2px;
    border: 1px solid #999;
    padding: 1px 0;
    margin-left: -3px;
    margin-top: -2px;
    background-color: #fff;
  }
  &-handler {
    position: absolute;
    width: 104%;
    height: 100%;
    left: -2%;
    cursor: pointer;
  }
}