#back_to_top{padding:3px;width:45px;height:45px;border-radius:50%;position:fixed;bottom:50px;right:50px;overflow:hidden;text-align:center;cursor:pointer;background-color:#212124;color:#fff;border:5px solid #fff;display:block;box-shadow:0 0 8px 0 #212124}#back_to_top:hover{cursor:pointer}#back_to_top i{font-size:28px}