Computer savy is not my name

So i thought i would do a little spring cleaning on the look of simple joys, and i seem to messed up my background image section. I don't really know to much about computer beside the fact i can turn it on and get to all my favorite sites. But you lost me at changing things up. If anyone has suggestions on how to make my background go all the way to the bottom of my page that would be great.

I thought the bugs on the background was so fitting for summer. All the joys of dealing with bugs while playing outside in the backyard.