.back_to_top{position:fixed;right:0;bottom:250px;z-index:1000;width:120px;height:120px;line-height:1;display:-webkit-box;display:-ms-flexbox;display:flex;text-align:center;-webkit-box-align:center;-ms-flex-align:center;align-items:center;-webkit-box-pack:center;-ms-flex-pack:center;justify-content:center;opacity:0;visibility:hidden;-webkit-box-shadow:0 8px 13px 0 rgba(0,0,0,.08);box-shadow:0 8px 13px 0 rgba(0,0,0,.08);background:#fff;cursor:pointer;-webkit-transition:.2s ease-in-out;transition:.2s ease-in-out}.back_to_top:hover{background-color:#f1f1f1}.back_to_top-icon{margin-bottom:20px}.back_to_top-icon img{width:38px}.back_to_top-text{font-size:14px}.back_to_top-visible{opacity:1;visibility:visible}