.back-to-top{background-color:#fff;border:1px solid #d1d1d1;border-radius:2px;bottom:55px;position:fixed;right:55px;-webkit-transition:all .2s;transition:all .2s;z-index:999999999}@media(max-width:639px){.back-to-top{background-color:hsla(0,0%,97%,.7);border:1px solid #e2e2e2;bottom:20px;right:20px}}.back-to-top a{display:block}.back-to-top img{padding:5px;width:38px}@media(max-width:639px){.back-to-top img{padding:0}}.back-to-top--active{opacity:1;visibility:visible}