Responsive HTML, CSS, Felxbox ONLY Design

Hi guys!

Pls, find below my solution to the Order Summary Component project. For a detailed outline of the solution, pls, read README_FINAL.md file.

Pls, help if you can with the following issues:

1. The site looks hideous in IE. How can I fix that?

2. I tested the design in Chrome, Firefox, IE and Opera. To test the design in Safari, is the Safari for Win version good enough an option on a DELL Inspiron 5502 i7 11th gen with an NVIDIA GeForce mx330 graphic board in it?

3. Pls, take a look at the :root selector. I had issues since the font-family wasn't pushed through on all elements and I had to write redundand code while designing the site along with Chrome dev tools. Did I implement it wrong in any way?

Thank you very much!