.sidebar-nav-parent-li {
    position: relative;
  }

  .sidebar-nav {
    padding-right: 10px;
  }

  .sidebar-nav .ul-after {
    content: '';
    width: 10px;
    height: 30px;
    /* background: red; */
    position: absolute;
    right: 10px;
    top: 0px;
    display: flex;
    align-items: center;
  }

  .ul-after-sanjiao {
    width: 0;
    height: 0;
    border-left: 8px solid #cecece;
    border-top: 8px solid transparent;
    border-bottom: 8px solid transparent;
    transition: transform 0.3s;
    position: relative;

  }

  .ul-after-sanjiao::after {
    content: '';
    width: 0;
    height: 0;
    position: absolute;
    top: -8px;
    left: -11px;
    border-left: 8px solid #fff;
    border-top: 8px solid transparent;
    border-bottom: 8px solid transparent;
  }

  .ul-after-sanjiao:hover {
    border-left: 8px solid #42b983;
  }

  .sidebar-nav-parent-li-shouqi .ul-after-sanjiao {
    transform: rotate(90deg);
    transition: transform 0.3s;
  }