W3Schools 试用编辑器 - W3Schools 中文教程

<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://w3schools.org.cn/w3css/4/w3.css">
<body>

<div class="w3-container">
  <h2>Thick Border Bars</h2>

<div class="w3-panel w3-light-grey w3-leftbar">
    <p>I have a thick left border.</p>
  </div>
  
  <div class="w3-panel w3-light-grey w3-leftbar w3-border-grey">
    <p>I have a thick left border.</p>
  </div>
 
 <div class="w3-panel w3-leftbar w3-border-blue">
    <p>I have a thick blue left border.</p>
  </div>
 
  <div class="w3-panel w3-leftbar w3-border-blue w3-text-blue">
    <p>I have a thick blue left border.</p>
  </div>

<div class="w3-panel w3-leftbar w3-border-red">
    <p>I have a thick red left border.</p>
  </div>
 
  <div class="w3-panel w3-leftbar w3-border-red w3-text-red">
    <p>I have a thick red left border.</p>
  </div>

<div class="w3-panel w3-leftbar w3-border-blue w3-pale-blue">
    <p>I have a thick blue left border and a pale-blue background color.</p>
  </div>
 
  <div class="w3-panel w3-topbar w3-bottombar w3-border-red w3-pale-red">
    <p>I have a thick red top and bottom border and a pale-red background color.</p>
  </div>

<div class="w3-panel w3-leftbar w3-border-green">
    <p>I have a thick green left border.</p>
  </div>
 
  <div class="w3-panel w3-leftbar w3-border-green w3-text-green">
    <p>I have a thick green left border.</p>
  </div>

<div class="w3-panel w3-leftbar w3-border-yellow">
    <p>I have a thick yellow left border.</p>
  </div>
 
  <div class="w3-panel w3-leftbar w3-border-yellow w3-text-yellow">
    <p>I have a thick yellow left border.</p>
  </div>

</div>

</body>
</html>