body {
    background-image: url('https://t.mwm.moe/pc');
    background-size: cover;
    background-repeat: no-repeat;
  }
@media all and (orientation : portrait){
    body {
    background-image: url('https://t.mwm.moe/mp');
    background-size: cover;
    background-repeat: no-repeat;
    }
}