Testimonial Grid Section

Fifth challenge from Frontend Mentor.

Quite a challenge I might say. I have worked before with flexbox and grid to better arrange divs, but never used the Grid layout as the main concept. I am quite happy with the final result of the mobile design, although I might say the quote-image on the background for some reason doesn't appear. On the other hand, I can see I am struggling with media queries and as such the width on the desktop design looks weird. Because of that, I will appreciate any advice and suggestions on how to improve the Desktop design.

Again, thanks a lot FrontMentor and FrontMentor team to allow me to challenge my skills and improve my self.