Need a little help with scaling/adjusting to changing resolutions.

So, I'm trying to make my website scalable with mobile devices and other devices with different resolutions but, I just can't seem to get my buttons to centre themselves to the screen. they're always a little off. any help?

here's the code: http://pastebin.com/nXSc4uqw here's some pictures: http://imgur.com/a/ktwZ8