lens/src/renderer/components/layout/sidebar-item.scss

.SidebarItem {
  $itemSpacing: floor($unit / 2.6) floor($unit / 1.6);

  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  width: 100%;
  user-select: none;

  > .nav-item {
    text-decoration: none;
    padding: $itemSpacing;
    width: 100%;
    height: 100%;
    color: inherit;
    cursor: pointer;

    > .link-text {
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }

    &.active, &:hover {
      background: $lensBlue;
      color: $sidebarActiveColor;
    }

    .expand-icon {
      --size: 20px;
    }
  }

  .sub-menu {
    $borderSize: 4px;
    border-left: $borderSize solid transparent;

    &.active {
      border-left-color: $lensBlue;
    }

    > .SidebarItem {
      color: $textColorPrimary;
      padding-left: 30px + $borderSize;
      line-height: 22px;

      .SidebarItem {
        padding-left: $padding * 2; // 3rd+ menu level
      }

      .nav-item {
        &.expandable {
          font-weight: 500;
        }

        &.active, &:hover {
          color: $sidebarSubmenuActiveColor;
          background: none;
        }
      }
    }
  }
}