Block quote formatting in distill-style posts

[albertfgu]

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Bug description

Block quotes aren't formatted properly in distill-style blog posts

How to reproduce the bug

The example blog post with block quotes gives this example

> ##### TIP
>
> A tip can be used when you want to give advice
> related to a certain content.
{: .block-tip }

which is displayed as:

However, the same example in a distill-style blog post looks like:

The former looks much better: Ideally at least, block quotes would support headers that are non-italicized and colored.

(Personally, I think that having the entire quote in non-italics is nicer, but at least the header should be formatted)

Error messages and logs

No response

What operating system are you using?

Mac

Where are you seeing the problem on?

Running locally without Docker

More info

No response