r:rgb({{ theme_color }} / 0.9);  /* dropdown toggled color */
        --scrollbar-color:rgb({{ theme_color }});  /* scroll indicator color */
        --treeitem-hover-color:rgb({{ theme_color }});  /* table of contents hover text color */
        --treeitem-selected-color:rgb({{ theme_color }});  /* table of contents selected text color */
        --thumbnail-hover-color:rgb({{ theme_color }} / 0.3);  /* thumbnail hover bg color */
        --thumbnail-selected-color:rgb({{ theme_color }} / 0.7);  /* thumbna