Apply CSS to block

Site URL: https://www.bethelpres.com/404

So many fixes begin with a block identifier that has  coding applied to that specific block. I absolutely cannot get this to work though I've copied and pasted others code (including from this forum) and have used the Chrome extension to identify the blocks. I've tried this is in 7.1 and 7.0 and on sites that have been made public and those that haven't. The attached screen grab is from a live 404 page that I was trying as an example. The hex code should have turned the "Oops" gold. There must be something incredibly simple that I am overlooking. Thanks for any insight.

I just checked & see your Custom CSS has a syntax error so all (or some CSS) won't work properly.

Can you send all current code here? We can help easier