Testimonials Grid Section with CSS Grid

Hello! I chose to do this challenge because I wanted to get to know the CSS grid more. The card layout is done with it but I used CSS flexbox for the profile part where you can find the author image and name. I found it difficult to make it responsive with just CSS grid, having to set margins every time. If you can point out areas I can improve on please feel free to do so. Your suggestions are much appreciated. Thank you!