Today I created a lightweight Testimonials Component which can be used on a personal website to showcase any testimonials you received from your past clients. I created an article where I explained in details how I created it. 
I hope this will be helpful for you as there is a Random Quote Generator project in the FreeCodeCamp curriculum and this project is very, very similar! 
You can also check it out Live on Codepen.
Very cool. I wonder if there’s someway you could check the max-height of the longest testimonial and use that information to prevent the box from resizing with each testimonial…
Well… you could do that in the background, but then you still have to accommodate with the viewport resizing so that would require an onResize function call which is a little expensive for the browser… although with a debounce function you could improve it a little bit