Product List II

Hello, this is a follow up to my last question about the “Products List” widget.  (I did not receive a reply.)  I have the “Product List” widget in the “Image Section 1”.  I would like to change the thumbnail size of each product on the MOBILE without changing the desktop’s size.  (The desktop size stays the same.)  On the MOBILE, I would like the product thumbnail pics to be the same width as the “Home Welcome” pic. 
My URL: http://www.eraeverlasting.com
The “coming soon” mode is active, so you will need more info to view my website.  Please let me know what you need to proceed.
Thank you for your help!