Adjust page content area width for Fulton

Hi, I'm using the Fulton template and it has a very narrow page width beneath the banner (which is full width).
 

For example products look very grouped to the middle, I'd much rather have bigger images and shown closer to full width. I'd also like to leave the banner as full width,

I've tried a few custom css pieces of code found on this forum, but they either don't work or also adjust the width of the banner.

For example this also adjusts the width of the banner

Any help would be much appreciated

Thanks