这是一款可自定义内容布局的CSS3二级下拉菜单代码，代码简洁而又强大实用的，导航下拉菜单内容可以自定义，可以是简单的多列，也可以是复杂的图文排版。

使用方法

在页面引入以下style.css样式文件

<link rel="stylesheet" href="css/style.css">

Html结构

在页面head部分引入html代码

<li><a href="#" class="drop">Home</a><!-- Begin Home Item -->
   
  <div class="dropdown_2columns"><!-- Begin 2 columns container -->
   
      <div class="col_2">
          <h2>Welcome !</h2>
      </div>
   
      <div class="col_2">
          <p>Hi and welcome here ! This is a showcase of the possibilities of this awesome Mega Drop Down Menu.</p>             
          <p>This item comes with a large range of prepared typographic stylings such as headings, lists, etc.</p>             
      </div>
   
      <div class="col_2">
          <h2>Cross Browser Support</h2>
      </div>
          
      <div class="col_1">
          <img src="img/browsers.png" width="125" height="48" alt="" />
      </div>
          
      <div class="col_1">
          <p>This mega menu has been tested in all major browsers.</p>
      </div>
        
  </div><!-- End 2 columns container -->
   
</li><!-- End Home Item -->