Responsive Testimonials Section - HTML & CSS (CSS Grid)

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

Using CSS Grid for all the layouts on the page.

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

Working with CSS Grid padding and margins.

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

For some reason I keep getting extra space at the end of my main grid; can't figure out what is causing the grid to overflow.