[cBB Chat phpbb] Where are the toolbar icons?

Hello, I've never had so much trouble to figure out where the icons used are.
I'm talking about the icons of the toolbar (exit, help, sound etc.).
Via the Inspector, the chat.css or the folder structure I can't find out where they are located.
#chat-toolbar a, .ic-input .cbb-btn

I must be completely blind, but I've been looking for it for some time.
I can't see the icons in any template folder, I'm going crazy!
There is nothing in the documentation about this except for the description of the Toolbox layouts.

What did i do wrong??

[IvanPF]

Hi,

The chat uses the same type of icons as the rest of the forum.
They are not images, it is a font. Specifically, "font awesome"
https://fontawesome.com/icons?d=gallery

Omg, thanks. Blind as a toastbread!