src/app/admin/admin-sidebar/admin-sidebar.component.scss
:host {

  /* SIDEBAR SIZE AND POSITION */

  /* Sidebar hierarchy:
   § nav
     § .sidebar-full-width-container (any OPTIONAL full width element with no horizontal margin or padding - it can be nested)
       § .sidebar-section-wrapper
         § .sidebar-fixed-element-wrapper
         § .sidebar-collapsible-element-outer-wrapper
           § .sidebar-collapsible-element-inner-wrapper
             § .sidebar-item
   */

  // Sidebar position
  position: fixed;
  left: 0;
  top: 0;
  z-index: var(--ds-sidebar-z-index);

  // Sidebar size and content position
  nav#admin-sidebar {

    max-width: var(--ds-admin-sidebar-fixed-element-width); // Sidebar collapsed width

    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;

    div#sidebar-top-level-items-container {
      flex: 1 1 auto; // Fill available vertical space
      overflow-x: hidden;
      overflow-y: auto;
      @include dark-scrollbar;
    }

    img#admin-sidebar-logo {
      height: var(--ds-admin-sidebar-logo-height);
    }

    ::ng-deep {

      // This class must be applied to any nested wrapper containing a sidebar section
      .sidebar-full-width-container {
        width: 100%;
        padding-left: 0;
        padding-right: 0;
        margin-left: 0;
        margin-right: 0;
      }

      // This class must be applied to the innermost block element containing a section or subsection link
      // (it can be applied together with `sidebar-collapsible-element-inner-wrapper`)
      .sidebar-item {
        padding-top: var(--ds-admin-sidebar-item-padding);
        padding-bottom: var(--ds-admin-sidebar-item-padding);
      }

      // These classes handle the collapsing behavior
      .sidebar-section-wrapper {

        display: flex;
        flex-direction: row;
        flex-wrap: nowrap;
        align-items: stretch;

        // These elements have fixed width and determine the width of the collapsed sidebar
        & > .sidebar-fixed-element-wrapper {
          min-width: var(--ds-admin-sidebar-fixed-element-width);
          flex: 1 1 auto; // Fill available space

          // Align the icons
          display: flex;
          flex-direction: row;
          justify-content: center;
          align-items: center;
        }

        & > .sidebar-collapsible-element-outer-wrapper {
          display: flex;
          flex-wrap: wrap;
          justify-content: flex-end; // make inner wrapper slide on the left when collapsing
          max-width: calc(100% - var(--ds-admin-sidebar-fixed-element-width)); // fill available space
          padding-left: var(--ds-dark-scrollbar-width); // leave room for scrollbar
          overflow-x: hidden; // hide inner wrapper when sidebar is collapsed

          // These elements have fixed width and slide on the left when the sidebar is collapsed
          // Their content should fill all available space
          & > .sidebar-collapsible-element-inner-wrapper {
            min-width: calc(var(--ds-admin-sidebar-collapsible-element-width) - var(--ds-dark-scrollbar-width));
            height: 100%;
            padding-right: var(--ds-admin-sidebar-item-padding);
          }
        }
      }

    }

    // Set here any style that depends on the sidebar status
    &.collapsed, &.transitioning, &.expanded { }

  }

  /* SIDEBAR STYLE */

  nav#admin-sidebar {

    background-color: var(--ds-admin-sidebar-bg);

    ::ng-deep {

      color: white;

      // Set here the style of the *-menu-item nested components
      .ds-menu-item {
      }

      a {
        color: var(--ds-admin-sidebar-link-color);
        text-decoration: none;

        &:hover, &:focus {
          color: var(--ds-admin-sidebar-link-hover-color);
        }
      }
    }

    div#sidebar-header-container {
      background-color: var(--ds-admin-sidebar-header-bg);
      .sidebar-fixed-element-wrapper {
        background-color: var(--ds-admin-sidebar-header-bg);
      }
    }

    div#sidebar-collapse-toggle-container {
      .sidebar-collapsible-element-inner-wrapper {
      }
    }
  }
}

::ng-deep {
  .browser-firefox-windows {
    --ds-dark-scrollbar-width: 20px;
  }
}
