Separator renders with wrong width/height

[noamcattan]

Bug report

Current Behavior

Even though I set height: 1px on my Separator component, the height of the result is sometimes 2px.

I'm seeing this happenning even in the demo page (with width instead of height). See the difference widths between the two:

Expected behavior

The thickness of the separator should be equal to the the width/height.

Your environment

Software	Name(s)	Version
Radix Package(s)	@radix-ui/react-separator	1.1.1
React	n/a	18.2.0
Browser	Chrome	131.0.6778.85
Assistive tech
Node	n/a	20.17.0
npm/yarn	npm	10.8.2
Operating System	Linux