WhiteSur-gtk-theme/src/sass/gtk/apps/_gnome-40.0.scss

//
// Extensions
//
window.background.csd {
  > stack, // GameMode setting
  > stack > scrolledwindow > viewport > box, // User Themes (Workspace) setting
  > box > stack > scrolledwindow > viewport > box {
    > list {
      @extend %circular_list;

      row.activatable { @extend %circular_row; }
    }
  }

  stack stack stack frame, // ArcMenu setting
  > stack > stack > box > frame, // Night Theme Switcher setting
  > stack > stack > box > box > frame, // Night Theme Switcher setting bottom lists
  > stack > box > stack > box > frame, // ArcMenu setting
  > stack > box > stack > scrolledwindow > viewport frame, // ArcMenu setting
  > stack > box > stack > box > scrolledwindow > viewport > frame, // ArcMenu setting
  > stack > grid > scrolledwindow > viewport > box > frame { // GSConnect setting
    > border { border: none; }
    border: none;

    > list {
      @extend %circular_list;

      row.activatable { @extend %circular_row; }
    }
  }

  > stack > box > box > list,
  > stack > box > stack > scrolledwindow > viewport > list { // ArcMenu setting sidebar
    border-bottom-left-radius: $wm_radius;
  }

  &.maximized, &.tiled, &.fullscreen {
    > stack > box > box > list,
    > stack > box > stack > scrolledwindow > viewport > list { // ArcMenu setting sidebar
      border-bottom-left-radius: $maximized_radius;
    }
  }
}

window.nightthemeswitcher headerbar {
  background: $header_bg;
  color: $header_fg;
}


//
// Gnome Control Center
//

window.background.csd {
  > contents {
    > leaflet.unfolded > box {
      > headerbar {
        @extend %side_headerbar_left;
      }

      > searchbar {
        @extend %side_searchbar;
      }

      > stack > widget > box > widget > headerbar,
      > stack > widget > overlay > leaflet.folded > box > headerbar {
        @extend %side_headerbar_right;
      }

      > scrolledwindow > viewport > widget > stack {
        > list.navigation-sidebar {
          background-color: rgba($dark_sidebar_bg, 1);

          > separator {
            background-color: transparent;
            margin: 0;
            min-height: 0;
          }
        }

        > box > list.navigation-sidebar { background-color: rgba($dark_sidebar_bg, 1); }
      }

      > stack.background { background-color: $base_color; }
    }
  }
}