.back-to-top{z-index: 999;position:fixed;bottom:200px;right:30px;width:40px;height:40px;background-color:#006ab7;color:#fff;border:none;border-radius:50%;cursor:pointer;font-size:24px;display:none;align-items:center;justify-content:center;text-align:center}.back-to-top:hover{background-color:#006ab7}