CodePen Embed - qBVYgbZ

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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<picture>
  <source srcset="https://laptrinhtudau.com/wp-content/uploads/2022/01/280px-Sacred_lotus_Nelumbo_nucifera.jpg" media="(max-width: 400px)">
  <source srcset="https://laptrinhtudau.com/wp-content/uploads/2022/01/hanoi.jpg">
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<p>Thay đổi kích thước chiều rộng trình duyệt và hình nền sẽ thay đổi ở 400px.</p>

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