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Full Version: Responsive web design techniques in CSS3
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Example:

<!DOCTYPE html>
<html>
<head>
  <title>Responsive Design Example</title>
  <style>
    /* Apply different font sizes based on screen width */
    p {
      font-size: 16px;
    }
    @media screen and (max-width: 600px) {
      p {
        font-size: 12px;
      }
    }
  </style>
</head>
<body>
  <p>This is a paragraph with responsive font size.</p>
</body>
</html>

Explanation:

CSS @media rule is used for media queries, which apply different styles based on the screen size or device. In this example, the p element has a font size of 16 pixels by default, but when the screen width is 600 pixels or less, the font size changes to 12 pixels.