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<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.cn/w3css/4/w3.css">
<style>
.w3-theme {color:#fff !important;background-color:#4CAF50 !important}
.w3-btn {background-color:#4CAF50;margin-bottom:4px}
.w3-code{border-left:4px solid #4CAF50}
.myMenu {margin-bottom:150px}
</style>
<body>
​
<!-- Top -->
<div class="w3-top">
  <div class="w3-row w3-white w3-padding">
    <div class="w3-half" style="margin:4px 0 6px 0"><a href='https://www.w3schools.cn'><img src='/images/w3schools.png' alt='w3schools.cn'></a></div>
    <div class="w3-half w3-margin-top w3-wide w3-hide-medium w3-hide-small"><div class="w3-right">THE WORLD'S LARGEST WEB DEVELOPER SITE</div></div>
  </div>
  <div class="w3-bar w3-theme w3-large" style="z-index:4;">
    <a class="w3-bar-item w3-button w3-left w3-hide-large w3-hover-white w3-large w3-theme w3-padding-16" href="javascript:void(0)" onclick="w3_open()">☰</a>
    <a class="w3-bar-item w3-button w3-hide-medium w3-hide-small w3-hover-white w3-padding-16" href="javascript:void(0)" onclick="w3_show_nav('menuTut')">教程</a>
   <a class="w3-bar-item w3-button w3-hide-medium w3-hover-white w3-padding-16" href="javascript:void(0)" onclick="w3_show_nav('menuRef')">REFERENCES</a>
  </div>
</div>
​
<!-- Sidebar -->
<div class="w3-sidebar w3-bar-block w3-collapse w3-animate-left" style="z-index:3;width:270px" id="mySidebar">
  <div class="w3-bar w3-hide-large w3-large">
    <a href="javascript:void(0)" onclick="w3_show_nav('menuTut')" class="w3-bar-item w3-button w3-theme w3-hover-white w3-padding-16" style="width:50%">教程</a>
    <a href="javascript:void(0)" onclick="w3_show_nav('menuRef')" class="w3-bar-item w3-button w3-theme w3-hover-white w3-padding-16" style="width:50%">References</a>
  </div>
    <a href="javascript:void(0)" onclick="w3_close()" class="w3-button w3-right w3-xlarge w3-hide-large" title="Close Menu">×</a>
  <div id="menuTut" class="myMenu">
  <div class="w3-container">
    <h3>教程</h3>
  </div>
  <a class="w3-bar-item w3-button" href="/html/default.asp">Learn HTML</a>
  <a class="w3-bar-item w3-button" href="/css/default.asp">Learn CSS</a>
  <a class="w3-bar-item w3-button" href="/w3css/default.asp">Learn W3.CSS</a>
  <a class="w3-bar-item w3-button" href="/colors/default.asp">Learn Colors</a>
  <a class="w3-bar-item w3-button" href="/js/default.asp">Learn JavaScript</a>
  <a class="w3-bar-item w3-button" href="/xml/default.asp">Learn XML</a>
  <a class="w3-bar-item w3-button" href="/sql/default.asp">Learn SQL</a>
  <a class="w3-bar-item w3-button" href="/php/default.asp">Learn PHP</a>
  </div>
  <div id="menuRef" class="myMenu" style="display:none">
  <div class="w3-container">
    <h3>References</h3>
  </div>
  <a class="w3-bar-item w3-button" href='/tags/default.asp'>HTML Tag Reference</a>
  <a class="w3-bar-item w3-button" href='/colors/default.asp'>HTML Color Reference</a>
  <a class="w3-bar-item w3-button" href='/cssref/default.asp'>CSS 参考</a>
  <a class="w3-bar-item w3-button" href='/cssref/css_selectors.asp'>CSS Selector Reference</a>
  <a class="w3-bar-item w3-button" href='/w3css/w3css_references.asp'>W3.CSS Reference</a>
  <a class="w3-bar-item w3-button" href='/jsref/default.asp'>JavaScript Reference</a>
  <a class="w3-bar-item w3-button" href='/php/php_ref_array.asp'>PHP Reference</a>
  <a class="w3-bar-item w3-button" href='/sql/sql_quickref.asp'>SQL Reference</a>
  </div>
</div>
​
<!-- Overlay effect when opening sidebar on small screens -->
<div class="w3-overlay w3-hide-large" onclick="w3_close()" style="cursor:pointer" title="close side menu" id="myOverlay"></div>
​
<!-- Main content: shift it to the right by 270 pixels when the sidebar is visible -->
<div class="w3-main w3-container" style="margin-left:270px;margin-top:117px;">
​
<div class="w3-panel w3-padding-large w3-card-4 w3-light-grey">
  <h1 class="w3-jumbo">CSS</h1>
  <p class="w3-xlarge">The Language for Styling Web Pages</p>
  <a class="w3-button w3-theme w3-hover-white" href="/css/default.asp">LEARN CSS</a>
  <a class="w3-button w3-theme w3-hover-white" href="/cssref/default.asp">CSS 参考</a>
  <p class="w3-large">
  <p><div class="w3-code cssHigh notranslate">
  body {<br>
      background-color: #d0e4fe;<br>}<br>h1 {<br>
      color: orange;<br>
      text-align: center;<br>}<br>p {<br>
      font-family: "Times New Roman";<br>
      font-size: 20px;<br>}
  </div>
  <a class="w3-button w3-theme w3-hover-white" href="/css/tryit.asp?filename=trycss_default" target="_blank">Try it Yourself</a>
</div>
​
<div class="w3-panel w3-padding-large w3-card-4 w3-light-grey">
  <h1 class="w3-jumbo">JS</h1>
  <p class="w3-xlarge">The Language for Programming Web Pages</p>
  <a href="/js/default.asp" class="w3-button w3-theme w3-hover-white">LEARN JS</a>
  <a href="/jsref/default.asp" class="w3-button w3-theme w3-hover-white">JS REFERENCE</a>
​
  <p><div class="w3-code jsHigh notranslate">
   // Click the button to change the color of this paragraph<br><br>function myFunction() {<br>
      var x;<br>
      x = document.getElementById("demo");<br>
      x.style.fontSize = "25px"; <br>
      x.style.color = "red"; <br>}
  </div>
  <a class="w3-button w3-theme w3-hover-white" href="/js/tryit.asp?filename=tryjs_default" target="_blank">Try it Yourself</a>
</div>
​
​
<footer class="w3-panel w3-padding-32 w3-card-4 w3-light-grey w3-center w3-opacity">
  <p><nav>
  <a href="/forum/default.asp" target="_blank">FORUM</a> |
  <a href="/about/default.asp" target="_top">ABOUT</a>
  </nav></p>
</footer>
​
<!-- END MAIN -->
</div>
​
<script>
// Script to open and close the sidebar
function w3_open() {
  document.getElementById("mySidebar").style.display = "block";
  document.getElementById("myOverlay").style.display = "block";
}
 
function w3_close() {
  document.getElementById("mySidebar").style.display = "none";
  document.getElementById("myOverlay").style.display = "none";
}
​
function w3_show_nav(name) {
  document.getElementById("menuTut").style.display = "none";
  document.getElementById("menuRef").style.display = "none";
  document.getElementById(name).style.display = "block";
  w3-open();
}
</script>
​
<script src="https://www.w3schools.cn/lib/w3codecolor.js"></script>
​
<script>
w3CodeColor();
</script>
​
</body>
</html>
​
​
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