In my repeating section, I'm trying to create a header row using Rich Text controls with an appropriate border and styles, but I'm unable to reduce the width below some kind of enforced minimum:

Nothing in the stock CSS indicates that a minimum width is being enforced, so is this a limitation of the designer? Is there a way around this, or am I force to use two controls: one for the text label (with transparent background and border), and one for the container (with visible background and border)?

This also applies to other controls like the Calculated Value, Single Line Textbox, etc.