html, body {
    margin: 0;
    padding: 0;
}

.download-btn {
    font-size: 50px;
    border:1px solid #111;
}

.mask-layer {
    width: 100vw;
    height: 100vh;
    position: fixed;
    z-index: 500;
    display: none;
    background-color: #fff;
    top: 0;
    left: 0;
}

.mask-layer div {
    background-size: cover;
    background-repeat: no-repeat;
}

.mask-layer .arrow {
    position: absolute;
    top: 0;
    right: 0;
    width: 3.42em;
    height: 4.68em;
    background-image: url('https://dapcdn.63cj.com/landings/static/image/arrow.png');
}

.mask-layer .arrow .text {
    position: absolute;
    bottom: -1.71em;
    left: -5em;
    width: 5.78em;
    height: 3.42em;
    background-image: url("https://dapcdn.63cj.com/landings/static/image/text_andr1.png");
}

.mask-layer .main {
    padding-top: 6.39em;
}

.mask-layer .main .phone {
    position: relative;
    width: 4.69em;
    height: 8.7em;
    margin: 0 auto;
    background-image: url("https://dapcdn.63cj.com/landings/static/image/phone_andr.png");
}

.mask-layer .main .phone .browser {
    position: absolute;
    width: 3.22em;
    height: 3.21em;
    top: 1.92em;
    left: -2.25em;
    background-image: url("https://dapcdn.63cj.com/landings/static/image/browser.png");
}

.mask-layer .main .phone .bird {
    position: absolute;
    width: 10.8em;
    height: 2.94em;
    top: 5.39em;
    left: -3.05em;
    background-image: url("https://dapcdn.63cj.com/landings/static/image/bird.png");
}