W3Schools Tryit 编辑器 - W3Schools 中文教程

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<title>W3.CSS</title>
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<div class="w3-container">
  <h1>Background Colors</h1>
  <p>The w3-color classes defines background colors for HTML elements:</p>
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<div class="w3-container w3-red">
  <h2>London</h2>
  <p>London is the most populous city in the United Kingdom, with a metropolitan area of over 9 million inhabitants.</p>
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<div class="w3-container w3-teal">
  <h2>London</h2>
  <p>London is the most populous city in the United Kingdom, with a metropolitan area of over 9 million inhabitants.</p>
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<div class="w3-container w3-yellow">
  <h2>London</h2>
  <p>London is the most populous city in the United Kingdom, with a metropolitan area of over 9 million inhabitants.</p>
</div>

<div class="w3-container w3-gray">
  <h2>London</h2>
  <p>London is the most populous city in the United Kingdom, with a metropolitan area of over 9 million inhabitants.</p>
</div>

<div class="w3-container w3-grey">
  <h2>London</h2>
  <p>London is the most populous city in the United Kingdom, with a metropolitan area of over 9 million inhabitants.</p>
</div>

</body>
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