html {
    font-size: 10px
}

body {
    background-color: #fff;
    margin: 0;
    padding: 0;
    font-family: "Microsoft YaHei"
}

.container {
    position: relative;
    max-width: 720px;
    margin: 0 auto;
    z-index: 0;
}

.container .downBtn {
    position: absolute;
    top: 33%;
    left: 11%;
    width: 80%;
    height: 1.1rem;
    background-image: url("../img/");
    background-size: 100% 100%;
    background-repeat: no-repeat;
    animation: rotate 2s linear infinite;
}

.container .footer {
    position: absolute;
    background-color: #1D215D;
    width: 100%;
    height: 2.7rem;
    color: #ffffff;
}

.footer p {
    padding: 0;
    margin: 0;
}

@keyframes rotate {
    0% {
        transform: translateY(0);
    }
    25% {
        transform: translateY(10px);
    }
    50% {
        transform: translateY(10px) scale(1.1, 0.9);
    }
    75% {
        ransform: translateY(10px);
    }
    100% {
        transform: translateY(0);
    }
}