* {
    padding: 0;
    margin: 0;
}

html,
head,
body {
    margin: 0 auto;
    max-width: 640px;
}

.background {
    position: relative;
    overflow: hidden;
}

.banner {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    margin: 0 auto;
    width: 100%;
    max-width: 640px;
    z-index: 999;
}

.swiper-slide {
    max-width: 640px;
    text-align: center;
    font-size: 18px;
    /* background: #fff; */
    /* Center slide text vertically */
    display: -webkit-box;
    display: -ms-flexbox;
    display: -webkit-flex;
    display: flex;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    -webkit-justify-content: center;
    justify-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    -webkit-align-items: center;
    align-items: center;
}

.swiper-slide img {
    display: block;
    width: 100%;
    max-width: 640px;
    height: 100%;
    object-fit: cover;
}

.swiper {
    width: 100%;
    height: 400px;
}

.hide {
    display: none;
}