Problems with css background

I'm trying to use this background image in the mobilegrid : http://gyazo.com/c1b03d67006ae4581e91... but when i use the code

Apperyio("grid1").css({
"background-image": "url(" + Apperyio.getImagePath("fondo_grid.png") + ")",

});

it looks like this:

http://gyazo.com/6df2a2f717fa0340b4e4...

So i need to adjust it in auto to the grid size so the background image could simulate a square for each user.
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