Website CSS Programming Help

Since I am the IT Manager, per say, I was tasked with converting our website from our old company to our new company since it was relatively new. We had a web designer within the company group, but he was with the other company. I have converted it all, but the height of the site won't go 100%. It's driving me nuts. Can someone tell me what I am doing wrong. I am attaching the CSS file. The footer should be touching the bottom. I've tried adjusting the height on all the containers, but it doesn't matter.

The page in question is CHI Aviation, Inc.