:root{--scrolltop-bg:#c0c0c0;--scrolltop-bg-hover:#007bff;--scrolltop-ripple:navy;--scrolltop-opacity:0.5;--scrolltop-opacity-hover:0.9;--scrolltop-shadow:0 3px 10px rgba(0,0,0,0.5);--scrolltop-shadow-hover:0 3px 10px rgba(0,0,0,0.5),0 3px 15px rgba(0,0,0,0.5)}html.dark{--scrolltop-bg:rgba(255,255,255,0.16);--scrolltop-bg-hover:rgba(37,99,235,0.92);--scrolltop-ripple:rgba(96,165,250,0.9);--scrolltop-opacity:0.65;--scrolltop-opacity-hover:0.95}.scrolltop{display:block;position:fixed;width:0;height:0;bottom:50px;right:23px;padding:0;overflow:hidden;outline:none!important;border:none;border-radius:50%;box-shadow:var(--scrolltop-shadow);background:var(--scrolltop-bg);-webkit-tap-highlight-color:rgba(0,0,0,0);transition:all .3s cubic-bezier(.25,.25,0,1);opacity:var(--scrolltop-opacity)}.scrolltop:hover{background-color:var(--scrolltop-bg-hover);text-decoration:none;box-shadow:var(--scrolltop-shadow-hover);opacity:var(--scrolltop-opacity-hover)}.scrolltop:before{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);content:"";width:0;border-radius:100%;background:var(--scrolltop-ripple);opacity:.9;filter:blur(0)}.scrolltop:active:before{width:120%;padding-top:120%;transition:all .2s ease-out;opacity:1}.scrolltop.reveal{width:42px;height:42px}.scrolltop,.scrolltop:before{background-image:url(/i/top-arrow.svg);background-position:center 50%;background-repeat:no-repeat}