html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    min-height: 100%;
    background: #fff;
    overflow-x: hidden;
}

.mobile-page {
    width: 100%;
    max-width: 430px;
    min-height: 100vh;
    margin: 0 auto;
    background: #fff;
    overflow-x: hidden;
}

.mobile-page img {
    display: block;
    width: 100%;
    height: auto;
    border: 0;
    margin: 0;
    padding: 0;
}

.img-split-wrap {
    display: block;
    width: 100%;
    overflow: hidden;
    line-height: 0;
    font-size: 0;
}

.placeholder {
    opacity: 0;
    pointer-events: none;
}

#top {
    position: fixed;
    left: 50%;
    top: 0;
    width: 100%;
    max-width: 430px;
    transform: translateX(-50%);
    z-index: 9999;
}

#down {
    position: fixed;
    left: 50%;
    bottom: 0;
    width: 100%;
    max-width: 430px;
    transform: translateX(-50%);
    z-index: 9999;
}

#right-middle {
    position: fixed;
    right: 0;
    top: 50%;
    width: 80px;
    height: auto;
    transform: translateY(-50%);
    z-index: 10000;
    display: block;
    border: 0;
    margin: 0;
    padding: 0;
}