Hegel center

Hello!

I have the hegel template. How can I change my thumbs size ( like, width: 670 px ) but sill have it all centered, including the project content?
I have tried a lot but still can't have it all centered.

basically, I just want this template but with bigger / wider thumbnails.
Please help :)

thanks,
Beatriz Cóias

http://cargocollective.com/pyramidstudio