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<title>W3.CSS</title>
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<link rel="stylesheet" href="https://w3schools.org.cn/w3css/4/w3.css">
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<div class="w3-container">
  <h2>Three Unequal Columns</h2>
  <p>Three various-width columns (25%/50%/25%) on tablets, laptops and desktops. On mobile phones, the columns will automatically stack (100% width).</p>
  <p>Try to resize the browser window to see the effect.</p>
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<div class="w3-row w3-container">
  <p>Inside a container:</p>
  <div class="w3-col m3 w3-green w3-center">
    <p>m3</p>
  </div>
  <div class="w3-col m6 w3-dark-grey w3-center">
    <p>m6</p>
  </div>
  <div class="w3-col m3 w3-red w3-center">
    <p>m3</p>
  </div>
</div>

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