.back_to_top{position:fixed;right:30px;bottom:30px;width:35px;height:35px;line-height:35px;text-align:center;background:#3fa71d;border-radius:.4rem;pointer-events:none;opacity:0;box-shadow:0 0 .5rem rgb(231,231,231);transition:all .2s ease-in-out;transform:translateY(-30rem);transition:all .3s;z-index:50}.back_to_top:hover{rotate:45deg}.back_to_top.show{opacity:1;pointer-events:auto;cursor:pointer;transform:translateY(0)}