How are .md files having their layout set?

[c6nabors]

I've been searching through the layout for this theme, and I can't seem to find how .md files are having their theme set, as there is no layout tag inside of their fences.

[tambuildsthings]

.md files are part of the post content collection (content/post), which are rendered in the [...blog] / [...page] file, which you can find here: https://github.com/onwidget/astrowind/blob/main/src/pages/%5B...blog%5D/%5B...page%5D.astro