@charset "UTF-8";
html,body,.back{
    width: 100%;
    height: 100%;
    padding: 0;
    margin: auto;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
}
.back{
    background-image: url(sui-towel_uc1221.jpg);
    background-position: center center;
    background-repeat: no-repeat;
    background-size: contain;
    max-width: 1200px;
    max-height: 900px;
}