DIV CSS 佈局教程網

<div id="main">
    <div id="nav">nav</div>
    <div id="content">content</div>
</div>

html, body {
    height: 100%;
    margin: 0px;
    padding: 0px;
}
#main {
    background-color: #999;
    height: 100%;
} 

#nav {
    background-color: #85d989;
    height: 50px;
}

#nav {
    background-color: #85d989;
    width: 100%;
    height: 50px;
}
#content {
    background-color: #cc85d9;
    width: 100%;
    position: absolute;
    top: 50px;
    bottom: 0px;
    left: 0px;
}