Not an issue, more of a question.

[RBGCNC]

I am extremely impressed with what you have accomplished in such a small amount of code and have one question. You use em for sizing in the media queries etc. Is there a specific reason for em versus rem? Thank you for sharing this amazing bit of code.

[Dibyajyoti-08]

The only reason i can be thinking of using em instead of rem is to make the size relative to the parent not the root(which is usually done by rem).