CodePen Embed - qBKGrzG



<div style="--mobileBG: url(https://picsum.photos/id/237/200/300); --desktopBG: url(https://picsum.photos/id/2/200/300);">

div {
  width: 800px;
  height: 600px;
  background-image: var(--desktopBG)
}

@media (max-width: 768px) {
  div {
      background-image: var(--mobileBG)
  }
}

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