SOURCE

<nav></nav>
<article></article>
<footer></footer>

html,body{
    height:100%;
    width:100%;
    margin:0;
    padding:0;
    overflow: hidden;
}
nav{
    width: 100%;
    height: 200px;
    background: red
}
article{
    position: absolute;
    top:200px;
    left:0;
    bottom:200px;
    right:0;
    overflow:auto;
    background: blue
}
footer{
    position: fixed;
    bottom:0;
    left:0;
    width: 100%;
    height: 200px;
    background: red
}