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运行代码 
<!DOCTYPE html>
<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>
<div class="w3-container">
    <h2>带边框的导航栏</h2>
    <p>使用w3-border类在导航栏周围添加边框：</p>
    <div class="w3-bar w3-border w3-light-grey">
        <a href="#" class="w3-bar-item w3-button">主页</a>
        <a href="#" class="w3-bar-item w3-button">链接 1</a>
        <a href="#" class="w3-bar-item w3-button">链接 2</a>
        <a href="#" class="w3-bar-item w3-button">链接 3</a>
    </div>
    <p>使用w3-round类添加圆角边框：</p>
    <div class="w3-bar w3-border w3-round w3-light-grey">
        <a href="#" class="w3-bar-item w3-button">主页</a>
        <a href="#" class="w3-bar-item w3-button">链接 1</a>
        <a href="#" class="w3-bar-item w3-button">链接 2</a>
        <a href="#" class="w3-bar-item w3-button">链接 3</a>
    </div>
    <p>使用w3-card类将导航栏显示为卡：</p>
    <div class="w3-bar w3-border w3-card-4 w3-light-grey">
        <a href="#" class="w3-bar-item w3-button">主页</a>
        <a href="#" class="w3-bar-item w3-button">链接 1</a>
 
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运行结果
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