App下載
實(shí)例代碼( Tip: 登錄后體驗(yàn)更佳 )
<!DOCTYPE html>
<html>
<title>编程狮(w3cschool.cn)</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
<body>
<div class="w3-container">
  <br>
  <div class="w3-container w3-border-bottom">
    <p>w3-border-top类为元素添加底部边框.</p>
  </div>
</div>
</body>
</html>
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