lens/dashboard/client/components/layout/main-layout.scss

.MainLayout {
  --main-layout-header: 40px;
  --sidebar-max-size: 200px;

  display: grid;
  grid-template-areas: "aside header" "aside tabs" "aside main" "aside footer";
  grid-template-rows: [header] var(--main-layout-header) [tabs] min-content [main] 1fr [footer] auto;
  grid-template-columns: [sidebar] minmax(var(--main-layout-header), min-content) [main] 1fr;
  height: 100vh;

  &.light {
    main {
      @include custom-scrollbar(dark);
      overflow-y: scroll;
    }
  }

  > .Tabs {
    grid-area: tabs;
    background: $layoutTabsBackground;

    .Tab {
      --color-active: #{$layoutTabsActiveColor};
    }
  }

  header {
    grid-area: header;
    background: $layoutBackground;
    padding: $padding $padding * 2;

    span + .lens-version {
      margin-left: $margin;
    }

    .lens-version {
      font-size: x-small;
      text-transform: uppercase;
    }
  }

  aside {
    grid-area: aside;
    position: relative;
    background: $sidebarBackground;
    white-space: nowrap;
    transition: width 150ms cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 100;

    &.pinned {
      width: var(--sidebar-max-size);
    }

    &:not(.pinned) {
      position: absolute;
      width: var(--main-layout-header);
      height: 100%;
      overflow: hidden;

      &.accessible:hover {
        width: var(--sidebar-max-size);
        transition-delay: 750ms;
        box-shadow: 3px 3px 16px rgba(0, 0, 0, .35);
        z-index: $zIndex-sidebar-hover;
      }
    }
  }

  main {
    @include custom-scrollbar;
    $spacing: $margin * 2;

    grid-area: main;
    overflow-y: scroll; // always reserve space for scrollbar (17px)
    overflow-x: auto;
    margin: $spacing;
    margin-right: 0;
  }

  footer {
    position: relative;
    grid-area: footer;
    min-width: 0; // restrict size when overflow content (e.g. <Dock> tabs scrolling)
  }
}