Center Aligning an element in Virtual Composer

Site: http://staffingbymiguel.ca/services/
Theme: Suffusion

Hey Devs!
I am trying to center align the grid of 6 images. I can accomplish this using margins/padding, but that will distort its responsive design.

I am trying to understand how to define the element to be center aligned in order to keep it the same no matter what the screen size is.

What css overides would I implement in order to center align the container that hols all 6 images?