[Plugin: Buddypress Who clicked at my Profile?] Avatar size

Hi, I’m struggling with “Buddypress Who clicked at my Profile?” plugin. It works great but the size of avatars is way too big. Can you help me with styling? Here is the plugin code:
https://pastebin.com/pdBQiBcW

I tried to use this code:

.avatar.photo{
width: 55px;
height: 55px;
}

and it works but it also affect buddypress main avatar..

If you would like, you can see this plugin in action here: https://tinyurl.com/pl5sxfw
It’s on the sidebar (“Kto odwiedzi? mój profil?”). You have to be logged in to see it. Please click “zaloguj” button and use login: test; password: test.

I will be grateful for your help. Thanks in advice