Sider Theme Mobile Content Padding

Hello!

I've been lightly tweaking Sider to fit my site. I have the "separating space" set to 41px to achieve the look of the demo content on my desktop. However, when I click to mobile, all the blog post content has 41px of padding on the left, thus pushing it off center. How can I fix this? (I would like everything to appear as the demo content.)

The site is:
http://www.petitemodernlife.com

Thank you!