Testimonial Slider - displays poorly on mobile

Site URL: https://www.heartfeltmemorials.org/

login for the site is "Pappy678!!"

Hi  - I am having trouble with this Index Gallery Testimonial Slider - it displays poorly on mobile with very large text.  Seeking CSS to fix the issue on mobile or somehow resolve it - even display the testimonials differently on mobile if all else fails!

You can use Testimonial Sliders plugin. It worked great & more customize options.