.back-to-top{align-items:center;background-color:#000;border:none;border-radius:50%;bottom:20px;cursor:pointer;display:flex;height:50px;justify-content:center;opacity:0;position:fixed;right:20px;transition:opacity .3s,visibility .3s;visibility:hidden;width:50px;z-index:1000}.arrow{border-left:3px solid #fff;border-top:3px solid #fff;height:12px;margin-top:5px;transform:rotate(45deg);width:12px}.back-to-top.is-show{opacity:1;visibility:visible}.back-to-top:hover{background-color:#333}