body {
    height: 0px;
    margin: 0;
}
.scroll-tip {
    position: fixed;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    color: #FFFFFF;
    font-size: 25px;
    text-align: center;
    animation: bounce 2s infinite;
    opacity: 1;
    transition: opacity 0.5s ease;
z-index:9999;
}
.scroll-tip i {
    display: block;
    font-size: 20px;
    margin-top: 5px;
}
@keyframes bounce {
    0%, 100% {
        transform: translate(-50%, 0);
    }
    50% {
        transform: translate(-50%, 10px);
    }
}
.scroll-tip.hide {
    opacity: 0;
    pointer-events: none;
}