When logging in, if username/password is not correct, the Login button shows an ❌ emoji which persists after subsequently editing the username and password fields. This is visually confusing because the ❌ implies the Log in button is disabled when it is not.

The same thing happens when signing up and you enter an email that already has an account. I'm sure this happens on many different buttons throughout the app.

I would suggest removing the ❌ on buttons altogether.