HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>screen and max-width</title>
  <style>
    p {
      background: #dbeafe;
    }

    @media screen and (max-width: 600px) {
      p {
        background: #fecaca;
      }
    }
  </style>
</head>
<body>
  <p>Resize under 600px</p>
</body>
</html>

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CSS screen Media Type — max-width