body {
    margin: 0
}

.main, .main div {
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center
}

.main {
    width: 100vw;
    min-height: 100vh;
    -webkit-box-orient: vertical;
    -webkit-box-direction: normal;
    -ms-flex-direction: column;
    flex-direction: column;
    -webkit-box-pack: start;
    -ms-flex-pack: start;
    justify-content: flex-start;
    position: absolute;
}

@media (orientation: landscape) {
    .main {
        max-width: 7.2rem;
        left: 0;
        right: 0;
        margin: 0 auto
    }
}

.mask-shade {
    position: absolute;
    top: 0;
    left: 0;
    display: none;
    width: 100%;
    height: 23.16rem;
    z-index: 99;
    background-color: rgb(0, 0, 0);
    opacity: 0.6;
}

.main .main-cover {
    position: absolute;
    top: 0;
    width: 7.2rem;
    height: 25.16rem;
    z-index: -1;
}

.main .guide {
    position: absolute;
    top: .1rem;
    right: 0.15rem;
    display: none;
    width: 3.91rem;
    height: 2.34rem;
    z-index: 100;
}

.main a {
    z-index: 2;
}

.main .download-btn {
    width: 3.3rem;
    height: 1.3rem;
    margin-left: .1rem;
    margin-top: 4.53rem;
}