How do I change the quote color vertical line in blog article?

I would like to change the color of the vertical line on the left of the quote in my blog article. Can someone tell me how?
Thank you!

I can’t seem to find what you’re referencing to

I’m sorry the link didn’t worked.
I did a print screen to show you which part I would like to change the color of.

Add a Block quote and select “All Block Quotes” and give it a side broder color

Like this


Thank you but it’s not in my website page that I need to change the border color but in my blog posts (CMS blog posts template). It doesn’t seem to work the same way.

Did you try the method i posted?

I wanted to but I don’t see the same menu in the blog template.