That line is 100% correct. 😁 There is a (�) question mark in a diamond character that I removed from the file in the git repo. You'll see that I replace that line with the same line just with that diamond character removed.

> This is what I get when I run "patch display.css [lots of errors]

Must be a copy-paste problem. I've uploaded the .patch file:
http://bcloudwenjxgcxjh6uheyt72a5isimzgg4kv5u74jb2s22y3hzpwh6id.onion/d1/URI:CHK:gsdzglsvekvgtigz5unlft6gxm:esluowfqfrrxfgmq4yrkijfs6kcnbbmpduphcx7txh4e4ry3rpea:3:10:2517/out.patch

After you get the file the sha256 of it should conform to:
913a1e2bb5d44777643b91cbd16743d10e80deafd46c97950f61cd3d4c997de8

After above you should be able to run:
patch display.css out.patch

(I should have really named it 'input.patch')

Tell me how you go.

> This [post] didn't notify me, because you wrote it as an answer to yourself.

Ah! Ok, I was wondering about that! So when someone clicks the 'reply' button I'm going to assume that Javascript is used to add all the needed recipients? One day I will turn on the javascript to test it but I want to be able to learn the non-javascript method of using GNUSocial first.