Responsive Grid with HTML/CSS

What are you most proud of, and what would you do differently next time?

I think I need to plan out before hand how to organize all of the elements that look similar but differ by a few characteristics. I feel like I used sooo many different classes this time.

What challenges did you encounter, and how did you overcome them?

So many problems- project took forever :) I have problems when I start to design the media query. If I don't do everything step by step and watch what happens as I code, I get huge mistakes and have to start over.

What specific areas of your project would you like help with?

Just advice on how to approach sorting out the elements that are the same, but just different by a few characteristics. I feel like I had to make way to many classes. There has to be an easier way right?