Font size in Notes text input is very small in Firefox
The font size inside the text input field is very small in Firefox (see the screenshot). In Chrome it is a little more clear, but still quite small.
Firefox:
![image](https://user-images.githubusercontent.com/11405096/179697795-3519b35c-6153-436c-a29c-cc0e6ab7cd24.png)
Chrome:
![image](https://user-images.githubusercontent.com/11405096/179697867-8d99c7b0-f299-43a6-b28e-b7937ee421e5.png)

Is it possible to get that text bigger and more readable?

Redmine version: 5.0.2
redmine-theme-minimalflat2 version: 1.9.0