What fluent design token do I use?

[coderdnewbie]

I am trying to custom brand my site using design token css, for example --accent-fill-rest. I have it mostly working but do not know what css the border uses. Does anyone know what this is?

I have included an example button, which is using my color for everything but the border (which is using the red theme color). Below is a screenshot.

[coderdnewbie]

Found it, it was --accent-stroke-control-rest