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<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
/* Đối với chiều rộng thiết bị nhỏ hơn 500px: */
body {
  background-repeat: no-repeat;
  background-image: url('https://laptrinhtudau.com/wp-content/uploads/2022/01/280px-Sacred_lotus_Nelumbo_nucifera.jpg'); 
}

/* Đối với chiều rộng thiết bị 500px và lớn hơn: */
@media only screen and (min-device-width: 800px) {
  body { 
     background-image: url('https://laptrinhtudau.com/wp-content/uploads/2022/01/hanoi.jpg'); 
  }
}
</style>
</head>
<body>

</body>
</html>

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