Increase avatar size + center users for easysocial users module (one page only)

How do you center users module for easysocial? I can add custom CSS if necessary, but trying to do a display:block;margin-left:auto;margin-rightLauto doesn't work when editing CSS directly in browser for testing.

Just looking to center it in screen b/c I only have a small set of users I'm featuring on main login page and I only want to add custom CSS for this on one page only not change module appearance everywhere on the site.

Also want to increase avatar sizes, too small and I only have 4-6 users max I'll be showing on login page centered in top position, entire width of page.

Thanks.