.samples-menu-left-border {
    display: none;
    position: absolute;
    left: 0;
    width: 4px;
    height: 100%;
    background: $blue;
  }
  .samples-submenu {
    background: #333333;
    .el-submenu__title {
      box-sizing: border-box;
      margin: 0;
      height: 52px;
      line-height: 52px;
      color: #fff;
      i {
        width: 20px;
        color: #fff;
        font-size: 20px;
      }
      .samples-submenu-title-text {
        margin-left: 10px;
        font-weight: bold;
      }
    }
    .el-submenu__title:hover {
      background-color: #404040;
    }
  }

  .el-submenu__title:focus, .el-submenu__title:hover{
    background: #333333
  }
  
  .samples-single-menu-item {
    background: #333333;
    box-sizing: border-box;
    margin: 0;
    height: 52px;
    line-height: 52px;
    color: #fff;
    i {
      color: #fff;
    }
    .samples-single-menu-item-title {
      margin-left: 10px;
      font-weight: bold;
    }
  }
  .samples-single-menu-item:hover {
    background-color: #404040;
  }
  
  .samples-submenu.is-opened > .el-submenu__title,
  .samples-single-menu-item.is-active {
    color: #fff;
    background-color: #404040;
    .samples-menu-left-border {
      display: block;
    }
  }
  
  .samples-submenu-child {
    background: #333333;
    .el-submenu__title {
      margin-left: -17px;
      .samples-submenu-title-circle {
        display: inline-block;
        box-sizing: border-box;
        width: 14px;
        height: 14px;
        border: 1px solid #fff;
        border-radius: 50%;
        .circle {
          display: none;
          position: relative;
          top: 2px;
          left: 2px;
          width: 8px;
          height: 8px;
          border-radius: 50%;
          background: #fff;
        }
      }
    }
  }
  
  .samples-single-submenu-child {
    margin-left: -17px;
    background: #333333;
    .samples-submenu-title-circle {
      display: inline-block;
      box-sizing: border-box;
      width: 14px;
      height: 14px;
      border: 1px solid #fff;
      border-radius: 50%;
      .circle {
        display: none;
        position: relative;
        top: 2px;
        left: 2px;
        width: 8px;
        height: 8px;
        border-radius: 50%;
        background: #fff;
      }
    }
    .samples-submenu-title-text {
      margin-left: 10px;
      color: #fff;
    }
  }
  
  .samples-submenu-child > .el-submenu__title:hover,
  .samples-single-submenu-child:hover {
    background-color: #4d4d4d;
  }
  
  .samples-submenu-child.is-opened > .el-submenu__title,
  .samples-single-submenu-child.is-active {
    background-color: #4d4d4d;
    > .samples-submenu-title-circle > .circle {
      display: block;
    }
  }
  
  .samples-el-menu-item {
    background: #333333;
    color: #fff;
    margin-left: -10px;
  }
  .samples-el-menu-item:hover {
    background: #666666;
  }
  .samples-el-menu-item.is-active {
    color: #fff;
    background: #666666;
  }

  .samples-menu-left-border + [class^=el-icon-]{
    margin-right:0;
  }