.upbtn{position:absolute;right:max(20px,calc(50% - 300px));bottom:calc(100% + 16px);display:flex;align-items:center;justify-content:center;width:48px;height:48px;padding:0;border:1px solid var(--line);border-radius:999px;background:var(--card);color:var(--accent);box-shadow:0 3px 10px rgba(80,66,44,.16);cursor:pointer;opacity:0;visibility:hidden;transition:opacity .4s,visibility 0s linear .4s,transform .12s}.upbtn[data-on]{opacity:1;visibility:visible;transition:opacity .13s,visibility,transform .12s}.upbtn[data-snap]{transition:none}.upbtn:active{transform:scale(.92)}.upbtn-from{position:absolute;top:0;left:0;width:1px;height:1px;pointer-events:none}