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;
    }
    
    .first {
        width: 15rem;
        height: 3rem;
        background: #fff;
        /* position: absolute;
        top: 0; */
    }
    /* .text {
        position: absolute;
        top: 1.5rem;
        left: 3rem;
    }
     */
    
    .icon,
    .head {
        float: left;
    }
    
    .icon {
        width: 2rem;
        height: 2rem;
        margin: 0.5rem 0 0 0.2rem;
        border-radius: .4rem;
    }
    
    .head {
        font-size: .64rem;
        /* font-weight: 600; */
        color: #000;
        margin: .2rem 0 0 0.1rem;
    }
    
    .head div {
        font-size: .56rem;
        color: #077605;
        line-height: .6rem;
        margin-top: .15rem;
    }
    
    .download1 {
        float: right;
        width: 5.02rem;
        height: 1.68rem;
        margin: .7rem .3rem 0 0;
        animation: pulse 1s ease-in-out infinite;
        /* 循环动画 /
transform-origin: center; / 以按钮中心为缩放原点 */
    }
    
    @keyframes pulse {
        0% {
            transform: scale(1);
        }
        50% {
            transform: scale(1.08);
        }
        /* 中间放大到 1.08 倍 */
        100% {
            transform: scale(1);
        }
    }
    
    .bg {
        position: relative;
        width: 15rem;
        background: #000;
    }
    
    .bg1 {
        float: left;
        width: 15rem;
        height: 37.78rem;
        /* background: #000; */
    }
    
    .download2 {
        position: absolute;
        top: 16.8rem;
        left: 3.04rem;
        width: 8.92rem;
        height: 1.84rem;
        animation: pulse 1s ease-in-out infinite;
    }
    
    .download3 {
        position: absolute;
        top: 38.7rem;
        left: 4.7rem;
        width: 5.6rem;
        height: 1.36rem;
        /* border-radius: .4rem; */
        animation: pulse 1s ease-in-out 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;
    }