.not-on-top{transition:opacity 0.1s}body:not(.on-top) .not-on-top-z-30{z-index:30}body.on-top .on-top-z-20{z-index:20}body.on-top .not-on-top{opacity:0;pointer-events:none}body:not(.on-top) .not-on-top{opacity:1}