[Beginner] How to change DatePicker inside button margin?

Hello,

I did not find howI could solve this. I would like to change DatePicker inside button margin for all DatePicker without having to rewrite the template.

I have found how I can do it on one DatePicker by putting this :







But I would like to avoid doing this on all DatePciker controls on my application. I would like to do it on my general style file.

With Snoop, I had a look at the control and I noticed the Button name is PART_Button and the default margin is 3,0,3,0. I would like to set it to 3,0,1,0.
I don't want to affect all buttons, just the DatePicker inside button.