Testimonial avatar class

Hi, I don’t use the testimonials provided with the Sydney theme but I do like to use the oval picture size on one of pictures on my site.
I am working with Elementor and when inserting the picture I give it the CSS class “roll-testimonials avatar” in the advanced tab from the elementor picture block.
Unfortunatly nothing happens.
Or is it better to make my own css class for this picture?

Hi,

Can you share your site URL here? And can you let me know the CSS code that you used for your CSS class?