实例代码：
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<style>
select{
width:100%;
padding:12px;
font-size:16px;
background-color:red;
border:none;
border-radius:5px;
}
</style>
</head>
<body>
<p>有样式的选择菜单</p>
<form>
<select id="country" name="country">
<option value="au">Australia</option>
<option value="ca">Canada</option>
<option value="usa">USA</option>
</select>
</form>
</body>
</html>
运行效果：
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