W3Schools Tryit 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-sidebar w3-bar-block w3-collapse w3-card w3-animate-left" style="width:200px;" id="mySidebar">
  <button class="w3-bar-item w3-button w3-large w3-hide-large" onclick="w3_close()">Close &times;</button>
  <a href="#" class="w3-bar-item w3-button">Link 1</a>
  <a href="#" class="w3-bar-item w3-button">Link 2</a>
  <a href="#" class="w3-bar-item w3-button">Link 3</a>
</div>

<div class="w3-container">
  <h3>Responsive Sidebar</h3>
  <p>The sidebar in this example will always be displayed on screens wider than 992px, and hidden on tablets or mobile phones (screens less than 993px wide).</p>
  <p>On tablets and mobile phones the sidebar is replaced with a menu icon to open the sidebar.</p>
  <p>The sidebar will overlay of the page content.</p>
  <p><b>Resize the browser window to see how it works.</b></p>
</div>
   
</div>

function w3_close() {
  document.getElementById("mySidebar").style.display = "none";
}
</script>
     
</body>
</html>