Comment by downrightmike

Or, you can just import a ublock origin filter, which is why this doesn't exist already:

news.ycombinator.com##td:style(color: #f8f8ff !important) news.ycombinator.com##div.toptext:style(color: #f8f8ff) news.ycombinator.com##span.c00:style(color: #f8f8ff !important) news.ycombinator.com##span.pagetop:style(color: #f8f8ff !important) news.ycombinator.com##textarea:style(color: #f8f8ff !important; background: #1a1a1a;) news.ycombinator.com##p:style(color: #f8f8ff !important) news.ycombinator.com##div.commtext:style(color: #f8f8ff !important)

And the xmas stuff still works