#back-to-top {
    position: fixed;
    bottom: 66px;
    right: 11px;
    display: none;
    background: #f2cd02;
    color: #000;
    font-size: 24px;
    width: 45px;
    height: 45px;
    text-align: center;
    line-height: 45px;
    border-radius: 50%;
    z-index: 999;
    transition: all 0.3s ease;
}

#back-to-top:hover {
    background: #f2cd02;
}