/*PC等大屏设备端壁纸(默认图片)*/
@media (orientation: landscape) {
    body {
        background-image: url('https://assets.nood.icu/res/all/background-picture.png');
    }
}
/*移动端壁纸*/
@media (orientation: portrait) {
    body {
        background-image: url('https://assets.nood.icu/res/all/background-portrait.jpg');
    }
}