Update / re-download the default theme and color palette

Yes, it’s been regularly updated. This issue I’ve noticed is only regarding how the content is rendered (theme / colors - which one I can’t say, I’m not a HTML expert).

Would this automatically pick up the latest default theme from github?

I’m no expert here, so I’m trying to understand which components I need to update to get my “old” forum look/feel like a “new” install.