Intellij IDEA Font Size

I made these bindings:

1. Font size up -> control - numpad 8
2. Font size down -> control - numpad 2
3. Font size reset -> control - numpad 5

To do so I went to "File -> Settings ... Keymap" then in search box typed "font", right clicked on the action to set the keys.

It warns you if the key is already in use.