.pagetop {
    cursor: pointer;
    position: fixed;
    right: 30px;
    bottom: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    transition: .3s;
    color: #ffffff;
    background: #ff7904;
    opacity: 0;
}
.pagetop:hover {
    box-shadow: 0 0 10px #cccccc;
}