.back-to-top{position:fixed;bottom:60px;right:60px;width:50px;height:50px;font-size:30px;padding:0 8px 4px;border-radius:4px;background:#34495e;cursor:pointer;text-align:center}.back-to-top:hover{background:#333}@media(max-width:768px){.back-to-top{bottom:10px;right:30px}}