Lightspeed/ecwid integration - mobile view kind of a mess

Firstly, I don't recommend integrating lightspeed/ecwid e-commerce to SS. It's kind of a huge design pain.

The mobile view on my phone doesn't look like the mobile preview on the site. I've had to add a ton of custom CSS on both SS and Lightspeed to get this presentable. Also, I can't seem to figure out how to get all the fonts into din-pro. Only some of it was affected by the css...

Site here. Help is extremely appreciated!

With font, you can add this to Design > Custom CSS

body * {
    font-family: 'd-din-pro' !important;
}