.backtotopbtn{background-color:#777;border:none;border-radius:2px;bottom:1.5rem;cursor:pointer;height:30px;opacity:0;padding:0;position:fixed;right:1.5rem;transition:all .3s ease-in-out;visibility:hidden;width:30px;z-index:98}.backtotopbtn:active,.backtotopbtn:focus,.backtotopbtn:hover{background-color:#333;border:none;border-radius:2px}.backtotopbtn:before{color:#fff;content:"\f077";font:var(--fa-font-solid);font-size:16px;left:calc(50% - 8px);position:absolute;top:calc(50% - 8px)}.show{opacity:1;visibility:visible}