How do you style a ion-datetetime inside ion-modal

Hello I’ trying to style a ion-datepicker, I need to reduce padding between numbers and reduce font size but I have tried styling ion-datetime, .calendar-day but I styles doesnt change at all, only thing I could do is change ion-datetime background-color just testing but nothing else changes.

imagen
imagen

changed background color just for a test:
imagen

Thank you