All content created by me (mjdxp) is in the public domain. Use it however you wish!
The tilde.club webring was created by Harper Lee. He didn't specify a license for it, but it came by default on the index page and he said "If we all use it, it will be awesome!", so I'm assuming I have permission to use it :P Check it out here!
The CSS is based on tilde.club's CSS, accessible here.
The font used is Terminus TTF, downloaded from this site, using the SIL Open Font License.
If I missed something, please let me know.