Editing testimonials

[boxingcentral]

Www.imjustboxing pass 0000

Example store: freetrain.com

How can increase the size of the images so that it is similar size to the example below.

i also want to increase the font size of the Author so that it is not the same size font as the review.

can anyone help with this? Thank you 

 

[boxingcentral]

Can any1 help

[boxingcentral]

I managed to change the font, how can i make the image larger on mobile ?