[Ionic 4]How do you remove the padding in .native-button?

I want to customize the button inside ion-item-option as Ionic3 style(full region) like.
However SHADOW show again without any --ion–xx way can be found.
How do you remove the padding in .native-button of <ion-item-option>?

Hope to change paddings in class “.button-native”

Use shadow web component is not a good idea, because Ionic4 doesn’t open enough, and designed to use shadow in a HURRY.

@avex. Were you able to find a solution for this- also giving me issues?

You may style shadow dom object with this: