.UIBackTopTopControl {
        background: rgba(0, 0, 0, 0) url("images/backtotop.png") no-repeat scroll center center;
        bottom: 100px;
        height: 48px;
        position: fixed;
        right: 10px;
        width: 48px;
        z-index: 10;
        background-size: contain;
        cursor: pointer;
        animation: bounce 2s infinite;
}
@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}