#ninja400 {
    background-image: url(img/promotions/ninja400-bg.jpg);
    background-size: cover;
}
#z400 {
    background-image: url(img/promotions/z400-bg.jpg);
    background-size: cover;
    background-position: right;
}
#zx6r {
    background-image: url(img/promotions/zx6r-bg.jpg);
    background-size: cover;
}
#z900 {
    background-image: url(img/promotions/z900-bg.jpg);
    background-size: cover;
    background-position: right;
}