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实例代码( Tip: 登录后体验更佳 )
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>
<div class="w3-container">
    <h2>粗边框</h2>
    <div class="w3-panel w3-light-grey w3-leftbar">
        <p>我的左边框很粗。</p>
    </div>
    <div class="w3-panel w3-light-grey w3-leftbar w3-border-grey">
        <p>我的左边框很粗。</p>
    </div>
    <div class="w3-panel w3-leftbar w3-border-blue">
        <p>我的左边框很粗。</p>
    </div>
    <div class="w3-panel w3-leftbar w3-border-blue w3-text-blue">
        <p>我的左边框很粗。</p>
    </div>
    <div class="w3-panel w3-leftbar w3-border-red">
        <p>我的左边框很粗。</p>
    </div>
    <div class="w3-panel w3-leftbar w3-border-red w3-text-red">
        <p>我的左边框很粗。</p>
    </div>
    <div class="w3-panel w3-leftbar w3-border-blue w3-pale-blue">
 
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运行结果
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