src/components/sidemenu/index.scss

@import '../../variables.scss';
.sidemenu {
  background: $sideMenuBgColor;
  width: $sideMenuWidth;
  position: relative;
  display: inline-block;
  padding: 20px 0;
  .sidemenu-toggle {
    text-align: center;
    cursor: pointer;
    position: absolute;
    top: 0;
    width: 40px;
    right: -40px;
    height: 30px;
    line-height: 30px;
    background: $sideMenuBgColor;
    border-radius: 0 4px 4px 0;
    display: none;
    img {
      width: 16px;
      text-align: center;
      vertical-align: middle;
    }
  }
  ul {
    list-style: none;
    padding: 0;
    margin: 0;
  }
  li {
    line-height: 0;
  }
  span, a {
    box-sizing: border-box;
    display: inline-block;
    position: relative;
    width: 100%;
    overflow-x: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
  .menu-item-selected {
    a {
      background: white;
    }
    a::before {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      width: 4px;
      height: 100%;
      background-image:linear-gradient(0deg, $startColor 0%, $intermediateColor 51%, $endColor 100%);
    }
  }
  .menu-item-level-1 {
    & > span {
      font-family: Avenir-Heavy;
      font-size: 18px;
      color: #333;
      padding-left: 20px;
      height: 40px;
      line-height: 40px;
    }
  }

  .menu-item-level-2, .menu-item-level-3 {
    cursor: pointer;
    & > span, & > a {
      font-family: Avenir-Medium;
      font-size: 14px;
      color: #666;
      &:hover {
        background: white;
        &::before {
          content: '';
          position: absolute;
          left: 0;
          top: 0;
          width: 4px;
          height: 100%;
          background-image:linear-gradient(0deg, $startColor 0%, $intermediateColor 51%, $endColor 100%);
        }
      }
    }
  }

  .menu-item-level-2 {
    & > span, & > a {
      padding-left: 40px;
      height: 36px;
      line-height: 36px;
      img.menu-toggle {
        float: right;
        width: 13px;
        height: 8px;
        margin: 14px 20px 14px 0;
      }
    }
  }
  .menu-item-level-3 {
    & > a {
      padding-left: 60px;
      height: 36px;
      line-height: 36px;
    }
  }
}

@media screen and (max-width: $mobileWidth) {
  .sidemenu {
    width: 0;
    .sidemenu-toggle {
      display: inline-block;
    }
    &.sidemenu-open {
      width: $sideMenuWidth;
    }
  }
}