Testimonials section using CSS Grid : challenge#2

My last challenge solution was using CSS Flexbox and this time I've used CSS Grid for this challenge as this layout seemed to be a nice one to implement inside grids. I didn't use grid-areas for this one which I'm still not very comfortable with using but will attempt to use it in my upcoming challenges. I've added an additional tablet layout between the mobile and desktop ones. Please let me know if you have any feedback or suggestions :)