How can I "center" a table

I’ve researched this for over an hour so hopefully I don’t end up looking really stupid here…

I’m trying to create a colored text box to highlight “lessons learned” throughout my book. I figured out that I can create a single cell table which works great - except I want to center this “box” on the page. I’ve read that others have saved their project in .docx format and fixed this is Word. Is there a way to just center a table in Scrivener?