a#back-to-top{width:44px;height:44px;line-height:41px;color:#fff;background:#13589a;display:inline-block;text-align:center;border-radius:100%;position:fixed;bottom:2rem;border:1px solid #fff;right:-50px;-webkit-transition:.5s right;transition:.5s right;opacity:.7}a#back-to-top.active{right:2rem}a#back-to-top:active,a#back-to-top:focus,a#back-to-top:hover{opacity:1}