woocommerce storefront width mobile screen problem

Hi Forum:

I have created a website for my artworks but I have a serious problem with certain parts of the responsive theme when using mobile screen devices. I am unable to use 100% of the width of the mobile device’s screen for the related products area. I’d like the 2 columns to take advantage of the screen’s width. Can anyone help me with the css code, please? See image below

https://www.samuelsotiega.com/wp-content/uploads/2018/06/D3A7134F-8FC1-43E7-A96D-D1AB01BD48F3.jpeg

The same applies to the widget section below.

https://www.samuelsotiega.com/wp-content/uploads/2018/06/4AD17667-8486-4602-B1D9-F2991A1AB672.jpeg

Can please anyone help?

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