Fixed app logo not appearing on Galaxy SIII.

Hi,
When testing this with the Chrome app on a Galaxy SIII the background-image for .smartbanner__icon wouldn't load.

I think it's an android bug. Maybe the chrome browser on this android device doesn't load background images if it's outside of the body tag? 

Either way, making this change of using instead using padding-top on the body tag seemed to fix it. 

Cheers,
Adam