What is the correct way to remove button paddings?

[likeSo]

The Button component keeps vertical padding.
I tried add p={0} and py={0} prop on Button, but it only remove the horizontal padding.
Finally, I find that there is a height: 40 style on the button's container, so i add h={'auto'}, It works!

But it this the correct way to do this? Why and where height: 40 style prop come from?