I mean to replace t with another svg for example. Not only the color etc.

Gepenyan, At this point no. But, this is a really good enhancement request! Thanks for asking.

I have added a GitHub issue to track this: github.com/atapas/notifyme/issues/5

A bit of background to this:

I am using the Bell icon from feather js.

import { Bell } from 'react-feather';

As part of the enhancement, I will have to keep it open for an icon supplied as an optional prop.

Btw.. feel free to do any changes to the code. I may get to it a bit late. Repo is here,