.main_container{margin:0 auto;max-width:1280px}.back-to-top{background-color:#fafafa;border:1px solid #f3f4f6;border-radius:50%;bottom:27px;box-shadow:0 4px 6px #0000001a;cursor:pointer;opacity:.8;padding:10px;position:fixed;right:90px;transition:opacity .3s}@media only screen and (max-width:600px){.back-to-top{bottom:100px;right:10px}}