HIYL-localization-web/src/assets/styles/sidebar.scss

#app {

  .main-container {
    height: 100%;
    transition: margin-left .28s;
    margin-left: $base-sidebar-width;
    position: relative;
  }

  .sidebarHide {
    margin-left: 0 !important;
  }

  .sidebar-container {
    -webkit-transition: width .28s;
    transition: width 0.28s;
    width: $base-sidebar-width !important;
    background-color: $base-menu-background;
    height: 100%;
    position: fixed;
    font-size: 0px;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 1001;
    overflow: hidden;
    -webkit-box-shadow: 2px 0 6px rgba(0, 21, 41, .35);
    box-shadow: 0px 0px 8px 0px rgba(0, 0, 0, 0.1);

    // reset element-ui css
    .horizontal-collapse-transition {
      transition: 0s width ease-in-out, 0s padding-left ease-in-out, 0s padding-right ease-in-out;
    }

    .scrollbar-wrapper {
      overflow-x: hidden !important;
    }

    .el-scrollbar__bar.is-vertical {
      right: 0px;
    }

    .el-scrollbar {
      height: 100%;
    }

    &.has-logo {
      .el-scrollbar {
        height: calc(100% - 50px);
      }
    }

    .is-horizontal {
      display: none;
    }

    a {
      display: inline-block;
      width: 100%;
      overflow: hidden;
    }

    .svg-icon {
      margin-right: 10px !important;
    }

    .el-menu {
      border: none;
      height: 100%;
      width: 100% !important;
    }

    .el-menu-item,
    .el-submenu__title {
      overflow: hidden !important;
      text-overflow: ellipsis !important;
      white-space: nowrap !important;
      height: 44px !important;
      line-height: 44px !important;
      margin: 0 2px !important;
      border-radius: 20px !important;
      color: #fff !important;
      display: flex !important;
      align-items: center !important;
    }

    // menu hover
    .submenu-title-noDropdown,
    .el-submenu__title {
      &:hover {
        background-color: rgba(0, 0, 0, 0.06) !important;
      }
    }

    & .theme-dark .is-active>.el-submenu__title {
      color: $base-menu-color-active !important;
    }

    & .nest-menu .el-submenu>.el-submenu__title,
    & .el-submenu .el-menu-item {
      min-width: $base-sidebar-width !important;

      &:hover {
        background-color: rgba(0, 0, 0, 0.06) !important;
      }
    }

    & .theme-dark .nest-menu .el-submenu>.el-submenu__title,
    & .theme-dark .el-submenu .el-menu-item {
      background-color: $base-sub-menu-background !important;

      &:hover {
        background-color: $base-sub-menu-hover !important;
      }
    }

    // theme-dark 深色主题
    &.theme-dark {
      box-shadow: 2px 0 8px rgba(0, 0, 0, 0.4);
      border-right: none;

      .el-menu-item.is-active {
        position: relative;
        background-color: rgba(0, 0, 0, 0.25) !important;
      }

      .el-submenu.is-active>.el-submenu__title {
        background-color: rgba(0, 0, 0, 0.25) !important;
      }

      .el-menu-item:not(.is-active),
      .submenu-title-noDropdown,
      .el-submenu__title {
        position: relative;

        &::before {
          content: '';
          position: absolute;
          inset: 0;
          background-color: transparent;
          pointer-events: none;
          z-index: 1;
          transition: background-color 0.2s;
        }

        &:hover::before {
          background-color: var(--current-color-dark-bg, rgba(64, 158, 255, 0.2));
        }
      }
    }

    // theme-light 浅色主题
    &.theme-light {
      border-right: 1px solid #e8eaf0;
      box-shadow: none;

      .el-menu-item,
      .el-submenu__title {
        color: rgba(0, 0, 0, 0.65);
      }

      .el-menu-item.is-active {
        color: var(--current-color, #409eff) !important;
        position: relative;

        &::before {
          content: '';
          position: absolute;
          inset: 0;
          background-color: var(--current-color-light, #ecf5ff);
          border-right: 3px solid var(--current-color, #409eff);
          pointer-events: none;
          z-index: 1;
        }
      }

      .el-submenu.is-active>.el-submenu__title {
        color: var(--current-color, #409eff) !important;
      }

      .el-menu-item:not(.is-active):hover,
      .submenu-title-noDropdown:hover,
      .el-submenu__title:hover {
        background-color: #f5f7fa !important;
        color: rgba(0, 0, 0, 0.85) !important;
      }

      .nest-menu .el-submenu>.el-submenu__title,
      .el-submenu .el-menu-item {
        background-color: #fafafa !important;

        &:hover {
          background-color: #f0f5ff !important;
        }
      }
    }
  }

  .hideSidebar {
    .sidebar-container {
      width: 54px !important;
    }

    .main-container {
      margin-left: 54px;
    }

    .el-menu:not(.el-menu--horizontal) {
      .submenu-title-noDropdown {
        padding: 0 !important;
        position: relative;

        .el-tooltip {
          padding: 0 !important;

          .svg-icon {
            margin-left: 20px;
          }
        }
      }
    }

    .el-submenu {
      overflow: hidden;

      &>.el-submenu__title {
        padding: 0 !important;

        .svg-icon {
          margin-left: 20px;
        }

      }
    }

    .el-menu--collapse {
      .el-submenu {
        &>.el-submenu__title {
          &>span {
            height: 0;
            width: 0;
            overflow: hidden;
            visibility: hidden;
            display: inline-block;
          }
        }
      }
    }
  }

  .el-menu--collapse .el-menu .el-submenu {
    min-width: $base-sidebar-width !important;
  }

  // mobile responsive
  .mobile {
    .main-container {
      margin-left: 0px;
    }

    .sidebar-container {
      transition: transform .28s;
      width: $base-sidebar-width !important;
    }

    &.hideSidebar {
      .sidebar-container {
        pointer-events: none;
        transition-duration: 0.3s;
        transform: translate3d(-$base-sidebar-width, 0, 0);
      }
    }
  }

  .withoutAnimation {

    .main-container,
    .sidebar-container {
      transition: none;
    }
  }
}

// when menu collapsed
.el-menu--vertical {
  &>.el-menu {
    .svg-icon {
      margin-right: 16px;
    }
  }

  .nest-menu .el-submenu>.el-submenu__title,
  .el-menu-item {
    &:hover {
      // you can use $subMenuHover
      background-color: rgba(0, 0, 0, 0.06) !important;
    }
  }

  // the scroll bar appears when the subMenu is too long
  >.el-menu--popup {
    max-height: 100vh;
    overflow-y: auto;

    &::-webkit-scrollbar-track-piece {
      background: #d3dce6;
    }

    &::-webkit-scrollbar {
      width: 6px;
    }

    &::-webkit-scrollbar-thumb {
      background: #99a9bf;
      border-radius: 20px;
    }
  }
}