<!DOCTYPE html>
<html>
<title>编程狮(w3cschool.cn)</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://7npmedia.w3cschool.cn/w3.css">
<link rel="stylesheet" href="https://www.w3schools.com/lib/w3-theme-black.css">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css">
<body>
<nav class="w3-sidebar w3-bar-block w3-card w3-animate-left w3-center" style="display:none" id="mySidebar">
<h1 class="w3-xxxlarge w3-text-theme">侧边导航栏</h1>
<button class="w3-bar-item w3-button" onclick="w3_close()">Close <i class="fa fa-remove"></i></button>
<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>
<a href="#" class="w3-bar-item w3-button">链接 4</a>
</nav>
<header class="w3-container w3-theme w3-padding" id="myHeader">
<i onclick="w3_open()" class="fa fa-bars w3-xlarge w3-button w3-theme"></i>
<div class="w3-center">
<h4>漂亮的响应性网站</h4>
<h1 class="w3-xxxlarge w3-animate-bottom">由W3.CSS</h1>
<div class="w3-padding-32">
<button class="w3-btn w3-xlarge w3-dark-grey w3-hover-light-grey" onclick="document.getElementById('id01').style.display='block'" style="font-weight:900;">学习 W3.CSS</button>
</div>
</div>
</header>
<div id="id01" class="w3-modal">
<div class="w3-modal-content w3-card-4 w3-animate-top">
<header class="w3-container w3-theme-l1">
<span onclick="document.getElementById('id01').style.display='none'"