Header
[width: 100%; position: absolute; top: 0px; height: 20%;]

Main
[width: 60%; position: absolute; left: 0px; top: 20%; height: 80%; padding: 0 20% 0 20%;]

Left
[width: 20%; position: absolute; left: 0px; top: 20%; height: 80%;]

Right
[width: 20%; margin: 0; position: absolute; top: 20%; right: 0px; height: 80%;]

Footer
[width: 100%; position: absolute; bottom: 0px; height: 10%;]