How can I delete the small avatars?

Hi,

I agree with the desire of Chantal Coolsma from last year:

„Avatars on posts are welcome. All those small avatars are annoying.
I want to remove them completely.“

Her solution was:

“I have added .avatar-14 to style.css now with display:none;”

Here is her post.

However, I can not find any class .avatar-14 in the style.css, where I could add a display: none;
Can someone tell me how I can remove the little avatars and can only keep the big one on the posts?

Thank you!
Morgensonne