#toTopBtn {
    width: 51px;
    height: 51px;
    overflow: hidden;
    z-index: 999;
    display: none;
    cursor: pointer;
    position: fixed;
    display: flex;
    justify-content: center;
    align-items: center;
    bottom: 40px;
    right: 20px;
    background: linear-gradient(to right, #018FFF, #0077D5);
}