Mobile device resize wrong

Hi,
Thanks for your plugin.
The slideshow images are 660 by 338, but the standard gallery is 600*400, it let a huge margin under the gallery.
If I change the gallery size option to 660 by 338 or 600 by 338, then it doesnot resize properly on mobile version, it become very small.

How to solve this?
I think upgrating to pro, so I need to see if the plugin work properly first.
Another question is there a way to update the template for all gallery on site with 1 setting? (without going through each gallery?)

The page I need help with: [log in to see the link]