.gotop {
    width: 40px;
    height: 40px;
    background-color: #4db2ec;
    font-size: 14px;
    color: #FFFFFF;
    font-weight: 600;
    text-align: center;
    position: fixed;
    bottom: 18%;
    right: 20px;
    z-index: 999;
    display: none;
}

.gotop img {
    display: block;
    width: 100%;
    height: 100%;
}