Please review my Todo App: made with React and Firebase

Hi guys,

I did it. I made my first app, completely on my own using Firebase.
It took me a while to go through the docs but basic functionality is working.

Now I would love to hear your feedback. What could I’ve done better? What do you hate / like especially about it?

The app itself is nothing special. Just another Todo App nobody needs. The styles I used are called Materialize CSS (from google).

Here is the App:
Here is the Code:

Edit: Almost forgot. You can edit a todo by double clicking it.
Edit 2: Added a “toggle all” button and also saved todo edits to firebase.

Thank you!