.gotop { position: fixed; bottom: 20px; right: 20px; z-index: 9999; display: none; }
.gotop.active { display: block; }
.go-top { display: flex; align-items: center; justify-content: center; width: 40px; height: 40px; background: #2867b2; color: #fff; border-radius: 50%; cursor: pointer; transition: all .3s; }
.go-top:hover { background: #1d4f91; }