Styles - edge display query

[brookefox]

Styles to me are somewhat baffling owing to the sheer number of settings and my inability to get comfortable with the manager. Here's an example of my ignorance: the image is of Gaieus's recently uploaded grass skp.

The edges of the concrete frame are displayed differently in the different styles but I can't figure out the setting which controls this. Is it just the color of the edge?

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[Gaieus]

Yes, to me it seems to be the edge colour setting which makes the difference.

[brookefox]

Yes, thanks, G. Sorry to trouble you.