body.offline-page #online {
  display: none;
}

body:not(.offline-page) #offline {
  display: none;
}

.cover-img-a {
  background-image: url('./../images/260701-startpage-white.png'); 
  background-size: 100% 100%;
  width: 100vw;
}

.cover-img-b {
  background-image: url('./../images/260701-startpage-black.png'); 
  background-size: 100% 100%;
  width: 100vw;
  position: absolute;
}


@media (max-aspect-ratio: 1/1) {
  .cover-img-a {
    background-image: url('./../images/260701-startpage-hochkant-white.png');
  }

  .cover-img-b {
    background-image: url('./../images/260701-startpage-hochkant-black.png');
  }
}