.up-btn{width:50px;height:50px;right:20px;bottom:20px;opacity:.8;background:#3a3a3a;cursor:pointer;position:fixed;z-index:100;transition:all .4s ease-in-out;padding:10px;box-sizing:border-box;display:flex;justify-content:center;align-items:center;transform:scale(1)}.up-btn.up-btn__hide{opacity:0;transform:scale(0);transition:all .4s ease-in-out}.up-btn:hover{opacity:1}.up-btn.up-btn_circle{border-radius:0!important}.up-btn__img{width:100%;max-width:100%}