.side-list,.pane-list.mixed{position:relative}:is(.side-list,.pane-list.mixed)[data-color-rail]:after{content:"";position:absolute;top:var(--rail-top);left:var(--rail-left);width:var(--rail-width);height:var(--rail-height);background:var(--rail-gradient);pointer-events:none;z-index:3}.side-list[data-color-rail]>li>a{border-left-color:transparent}.pane-list.mixed[data-color-rail]>li>a{border-right-color:transparent}