.back-to-top{visibility:hidden;opacity:0;z-index:99999;background:var(--primary);border-radius:50%;width:40px;height:40px;transition:all .4s;position:fixed;bottom:20px;right:20px}.back-to-top i{color:var(--light);font-size:24px;line-height:0}.back-to-top:hover{background:var(--secondary);color:var(--light)}.back-to-top.active{visibility:visible;opacity:1}