Jetpack tiled gallery not displaying full width in content area

Hi Guys

I have installed the Jetpack tiled gallery but have noticed that it is not displaying full width of pinboards main content area. i have searched for a fix but could only find options where i need to alter the themes functions php file, I tried this but broke the code and my blog, luckily i managed to upload a replacement and its working now.

does anyone know of a fix for this issue, possibly css?

Cheers
John