Dribbble Invite Giveaway

Ive got 2x dribbble invites to giveaway, as its my first time i thought id make a little microsite for them:

Give it a resize, not sure how the background works on mobile with it being fixed, so any suggestions give me a shout.

Its got a few css3 transitions and some resize effects. 3 images in total and weighs in at just over 200kb uncompressed.