It's just annoying to me. It looks like the website is broken. I'll be trying to add it to uBlock or something. If it had text then maybe I'd keep it. As it stands it's not actually communicating anything meaningful. Poor UX.
A ribbon [1] or armband [2] is a really common and subtle way of symbolising mourning, I'm quite surprised people aren't more aware of this practise.
It's a nice gesture to people who likely had some impact on lots of our lives
I think a HTML comment explaining why would have stopped me.