a {
        text-decoration: none;
    }
    
    html {
        font-size: 50px;
    }
    
    @media screen and (min-width: 320px) {
        html {
            font-size: 21.33333333px;
        }
    }
    
    @media screen and (min-width: 355px) {
        html {
            font-size: 23.66666666666667px;
        }
    }
    
    @media screen and (min-width: 360px) {
        html {
            font-size: 24px;
        }
    }
    
    @media screen and (min-width: 375px) {
        html {
            font-size: 25px;
        }
    }
    
    @media screen and (min-width: 384px) {
        html {
            font-size: 25.6px;
        }
    }
    
    @media screen and (min-width: 400px) {
        html {
            font-size: 26.66666667px;
        }
    }
    
    @media screen and (min-width: 412px) {
        html {
            font-size: 27.46666666666667px;
        }
    }
    
    @media screen and (min-width: 414px) {
        html {
            font-size: 27.6px;
        }
    }
    
    @media screen and (min-width: 424px) {
        html {
            font-size: 28.26666667px;
        }
    }
    
    @media screen and (min-width: 432px) {
        html {
            font-size: 28.8px;
        }
    }
    
    @media screen and (min-width: 480px) {
        html {
            font-size: 32px;
        }
    }
    
    @media screen and (min-width: 540px) {
        html {
            font-size: 36px;
        }
    }
    
    @media screen and (min-width: 720px) {
        html {
            font-size: 48px;
        }
    }
    
    @media screen and (min-width: 750px) {
        html {
            font-size: 50px;
        }
    }
    
    @media screen and (min-width: 1080px) {
        html {
            font-size: 72px;
        }
    }
    
    @media screen and (min-width: 1200px) {
        html {
            font-size: 80px;
        }
    }
    
    @media screen and (min-width: 1240px) {
        html {
            font-size: 82.66666666666667px;
        }
    }
    
    @media screen and (min-width: 1440px) {
        html {
            font-size: 96px;
        }
    }
    
    @media screen and (min-width: 1600px) {
        html {
            font-size: 106.6666666666667px;
        }
    }
    
    @media screen and (min-width: 2160px) {
        html {
            font-size: 144px;
        }
    }
    
    body {
        min-width: 320px;
        width: 15rem;
        margin: 0 auto;
        line-height: 1.5;
        font-family: Arial, Helvetica;
    }
    
    @keyframes myfirst {
        0% {
            transform: scale(1);
        }
        26% {
            transform: scale(1.1);
        }
        53% {
            transform: scale(1);
            /* 保持在放大状态，停留 */
        }
    }
    
    @-webkit-keyframes myfirst
    /* Safari 与 Chrome */
    
    {
        0% {
            transform: scale(1);
        }
        50% {
            transform: scale(1.1);
        }
        100% {
            transform: scale(1.1);
            /* 保持在放大状态，停留 */
        }
    }
    
    .first {
        width: 15rem;
        height: 3rem;
        z-index: 9999;
        background: #fff;
    }
    /* .text {
        position: absolute;
        top: 1.5rem;
        left: 3rem;
    }
     */
    
    .icon,
    .head {
        float: left;
    }
    
    .icon {
        width: 2.2rem;
        height: 2.2rem;
        margin: 0.4rem 0 0 0.2rem;
        border-radius: .4rem;
    }
    
    .head {
        font-size: .5rem;
        color: #000;
        margin: .4rem 0 0 0.3rem;
    }
    
    .head div {
        font-size: .32rem;
        margin-top: .2rem;
    }
    
    .download1 {
        float: right;
        width: 6.04rem;
        height: 2.4rem;
        margin: .3rem .2rem 0 0;
        animation: myfirst 0.5s;
        -webkit-animation: myfirst 0.5s;
        animation-name: myfirst;
        animation-duration: 1s;
        animation-timing-function: steps(2, jump);
        animation-timing-function: none;
        animation-direction: alternate;
        animation-iteration-count: infinite;
    }
    
    .bg {
        position: relative;
        width: 15rem;
        background: #000;
    }
    
    .bg1 {
        float: left;
        width: 15rem;
        height: 31.72rem;
    }
    
    .download2 {
        position: absolute;
        top: 18.8rem;
        left: 2.09rem;
        width: 10.82rem;
        height: 2.72rem;
        animation: myfirst 0.5s;
        -webkit-animation: myfirst 0.5s;
        animation-name: myfirst;
        animation-duration: 1s;
        animation-timing-function: steps(2, jump);
        animation-timing-function: none;
        animation-direction: alternate;
        animation-iteration-count: infinite;
    }
    
    .texttishi {
        position: absolute;
        top: 10rem;
        width: 15rem;
        background-color: rgba(8, 8, 8, 0.5);
        /* 半透明背景 */
        text-align: center;
        color: #ec8181;
        display: none;
    }