Issues with Testimonial Avatars

So the page linked has some testimonials, the issue is that I do not want any avatar displayed. I have removed the avatar image on the desktop view, everything is fine, but on mobile devices, it shows the “Choose your Image” circular icon which I don’t want. I already tried adding a transparent image to match the white background but instead, it creates gaps which I don’t want, any possible solution to that?

Image on mobile view: https://ibb.co/VJybcBK

Thank you kindly.

The page I need help with: [log in to see the link]