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<html>
<head>
<title>W3.CSS(w3cschool.cn)</title>
<meta name="viewport" content="width=device-width, initial-scale=1" charset="UTF-8">
<link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
</head>
<body>
<form class="w3-container w3-card-4">
<h2>选框</h2>
<p>
<input class="w3-check" type="checkbox" checked="checked">
<label>牛奶</label></p>
<p>
<input class="w3-check" type="checkbox">
<label> 糖</label></p>
<p>
<input class="w3-check" type="checkbox" disabled>
<label>柠檬 (禁用)</label></p>
</form>
</body>
</html>