Limit width of <hr>?

I was looking through my old comments and saw something that kind of jumped at me:

https://tildes.net/~games/by0/moderators_of_r_games_have_closed_the_sub_for_the_day_and_posted_a_serious_message_about_harassment#comment-2yll

I use ---- often to separate content in my comments and I'm starting to notice that it looks quite bad on some resolutions:

With some extra rules to make it the same width as the text, this is what it looks like:

hr {
    width: 100%;
    max-width: 40rem;
    display: inline-block;
}

If that looks good I'll do a PR.