JA T3 Blank full background image/gradient/color

Hi.
I cant figure how to set full background image/gradient/color in latest JA T3 Blank template.
When i use full hd resolution the background have white space at the bottom. Any t3-wrapper classes dont make it work
Any suggestions?
http://preview.tinyurl.com/pc2w4cf (safe preview, clean site)

and the old site works fine with full background image
http://preview.tinyurl.com/o3mts7l

Thanks