<header>
  ヘッダー
</header>
<div id="contents">
  コンテンツ
</div>
<footer>
  フッター
</footer>
* {
  font-size: 20px;
  line-height:2em;
}
header {
  background-color: #ffdddd;
}
div#contents {
  background-color: #ddffdd;
}
footer {
  background-color: #ddddff;
}

External CSS

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External JavaScript

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