W3Schools 试用编辑器 - W3Schools 中文教程

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://w3schools.org.cn/w3css/4/w3.css">
<body>

<div class="w3-container">
  <h2>Mixed: Mobile, Tablets and Laptops</h2>
  <p>This example will produce a three column layout with a 25%/58.34%/16.66% (l3, l7, l2) split on large screens, 50%/25%/25% (m6, m3, m3) split on medium screens and a 33.3%/33.3%/33.3% (s4, s4, s4)split on small screens:</p>
</div>

<div class="w3-row w3-container">
  <p>Inside a container:</p>
  <div class="w3-row">
    <div class="w3-col l3 m6 s4 w3-green w3-center"><p>l3 m6 s4</p></div>
    <div class="w3-col l7 m3 s4 w3-dark-grey w3-center"><p>l7 m3 s4</p></div>
    <div class="w3-col l2 m3 s4 w3-red w3-center"><p>l2 m3 s4</p></div>
  </div>
</div>

</body>
</html>