body.sub    {
    background-position: center top 67.1875vw;
}

.key:before {
    height: 92.708vw;
}

.detailinner    {
    width: 100%;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.detailinner img.left    {
    position: relative;
    left: 25px;
}

@media screen and (max-width: 834px)    {
    .key:before {
        height: 199vw;
    }
    
    .detailinner img.left    {
        position: relative;
        left: 0;
    }

}