用css网站布局之十步实录！（三）

<div id="page-container">
<div id="main-nav">Main Nav</div>
<div id="header">Header</div>
<div id="sidebar-a">Sidebar A</div>
<div id="content">Content</div>
<div id="footer">Footer</div>
</div>

#main-nav {
background: red;
height: 50px;
}
#header {
background: blue;
height: 150px;
}
#sidebar-a {
background: darkgreen;
}
#content {
background: green;
}
#footer {
background: orange;
height: 66px;
}