Coding Bootcamp Testimonials Slider using Sass & JS

I coded desktop first, mobile responsive slider using Sass and flexbox layout. User can use either mouse click/ keyboard left + right arrow key, trackpad & touch screen swipe to slide the testimonials☺️

-My questions: <1> I tried to change the size of the svg icons smaller for the mobile version, but by changing its width & height, I couldn't make it happen. I googled about it but couldn't find a clue. <2> My screenshot of this challenge looks terrible even after taking a new one🙀 It doesn't look so broken as the screenshot in the real preview for me. So I'm confused. Any idea how I can fix that..?

If you know how to do it, please let me know:))

Any feedback & suggestion for improvement would be very much appreciated ☺️🙏!!