W3.CSS具有非常漂亮且响应迅速的CSS，用于表单设计。使用以下CSS：
| 序号 | 类名和描述 |
|---|---|
| 1个 | w3-group 表示带边框的容器。可用于分组标签和输入。 |
| 2 | w3-input 美化输入控件。 |
| 3 | w3-label 美化标签。 |
| 4 | w3-checkbox w3-checkmark 美化一个复选框/单选按钮。 |
<html>
<head>
<title>The W3.CSS Forms</title>
<meta name = "viewport" content = "width = device-width, initial-scale = 1">
<link rel = "stylesheet" href = "https://www.w3schools.com/lib/w3.css">
</head>
<body>
<form class = "w3-container w3-card-8">
<div class = "w3-group">
<input class = "w3-input" type = "text" style = "width:90%" required>
<label class = "w3-label">User Name</label>
</div>
<div class = "w3-group">
<input class = "w3-input" type = "text" style = "width:90%" required>
<label class = "w3-label">Email</label>
</div>
<div class = "w3-group">
<textarea class = "w3-input" style = "width:90%" required></textarea>
<label class = "w3-label">Comments</label>
</div>
<div class = "w3-row">
<div class = "w3-half">
<label class = "w3-checkbox">
<input type = "checkbox" checked = "checked">
<div class = "w3-checkmark"></div> Married
</label>
<br>
<label class = "w3-checkbox">
<input type = "checkbox">
<div class = "w3-checkmark"></div> Single
</label>
<br>
<label class = "w3-checkbox">
<input type = "checkbox" disabled>
<div class = "w3-checkmark"></div> Don't know (Disabled)
</label>
<br>
<br>
</div>
<div class = "w3-half">
<label class = "w3-checkbox">
<input type = "radio" name = "gender" value = "male" checked>
<div class = "w3-checkmark"></div> Male
</label>
<br>
<label class = "w3-checkbox">
<input type = "radio" name = "gender" value = "female">
<div class = "w3-checkmark"></div> Female
</label>
<br>
<label class = "w3-checkbox">
<input type = "radio" name = "gender" value = "female" disabled>
<div class = "w3-checkmark"></div> Don't know (Disabled)
</label>
</div>
</div>
</form>
</body>
</html>