Hi, My page keeps moving and i am unsure why, ill post my code you can understand. If anyone can edit my code i'd be thankful

HTML - http://pastebin.com/xES7zc6Z
Another page so you can see the difference - http://pastebin.com/Pm8EyLz0
CSS - http://pastebin.com/Ry9XB0uC

As you can see, my buttons at the top of the page jump between the two pages
Thanks to anyone who can fix