CSS for Form Field Height

Right, 7h later and i’ve got this:

%root%
.bricks-button {
height:500px;
}

This obviously changes the button. Swapping .bricks button for the field ID for one of the form sections does nothing.

What am i getting wrong?!

(P.S - Seems like things used to be different here. In this thread, the dude gets email support!

NO BUG: ID changes to 'root' on template in custom CSS of page)