A bit late to the party, but absolutely! I put together a terminal-like one a couple years ago:
https://zampano.midnight.pub/_theme.cssIt works fine, although it uses a "scanline" effect that doesn't currently work properly if the page is taller than your browser window (the scanlines stop at where the bottom of the window was). I've been meaning to troubleshoot that, but haven't gotten around to it.
If you have thoughts on another theme or aesthetic, please let me know, as I love coming up with them!