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Hey @heimoviktor
I guess you are trying to use different height and width of login form for mobile and tablet devices.
You would need custom CSS for this purpose to achieve.
Luckily, Login Customizer supports custom CSS, You can find it from Login Customizer -> Customizer -> Custom CSS/JS -> CSS.
This only runs on login pages i.e. Login, Lost Password, Register..
If you need any assistance do let me know.
Have a nice day!