/* Follow the 1400px topic content edge, retaining the original 20px gutter
   when there is room. On smaller viewports keep the whole control visible. */
body.collection-page .backtop{
    z-index:10;
    left:auto;
    right:24px;
    right:max(24px,calc((100% - 1400px)/2 - 79px),env(safe-area-inset-right,0px));
    transform:none;
}
@media(max-width:800px){
    body.collection-page .backtop{
        right:12px;
        right:max(12px,env(safe-area-inset-right,0px));
    }
}