"

From 2013.igem.org

1. header

{ width:100%; height:200px; background:blue; float:left; }

1. header #middle

{ width:976px; height:100%; background:green; margin-left:auto; margin-right:auto; }

1. menu

{ width:100%; height:30px; background:red; float:left; }

1. menu #dropdown

{ width:976px; height:100%; background:purple; margin-left:auto; margin-right:auto; }

1. all_content

{ width:100%; height:200px; background:silver; float:left; }

1. all_content #container

{ width:976px; height:100%; margin-left:auto; margin-right:auto; background:cyan; }