<!DOCTYPE html>
<html lang="ja">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="css/style.css">
</head>

<body>
    <h1>見出し</h1>
    <p>段落</p>
    <ul>
        <li>リスト</li>
        <li>リスト</li>
    </ul>
    <div>グループ化</div>
    <a>リンク</a>
    <span>グループ化</span>
    <i>細目</i>
</body>

</html>
h1,p,li,div,a,span,i{
  border:1px solid #f00;
/*   margin-bottom:10px; */
  margin-top:50px;
  margin-left:20px;
  width:300px;
}

External CSS

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External JavaScript

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