.back_to_top{width:50px;height:50px;position:fixed;bottom:0;transform:translateY(30px);right:30px;display:inline-block;text-align:center;opacity:0;z-index:99999;margin-bottom:constant(safe-area-inset-bottom);margin-bottom:env(safe-area-inset-bottom);transition:opacity .4s cubic-bezier(.165,.84,.44,1),transform .4s cubic-bezier(.165,.84,.44,1)}.back_to_top.is-left{right:auto;left:30px}.back_to_top svg{line-height:50px;font-size:30px;display:inline-block;position:relative}.back_to_top.active{opacity:1;transform:translateY(-30px)}.back_to_top:focus{outline:0!important}.back_to_top:hover{transform:translateY(-36px)}