Ask HN: Hacker News Fixed Width for Widescreen Monitors" Userstyle?

I've checked several of the Userstyles.org mirrors, as well as more modern websites, but cannot find this particular userstyle I used all the time.

  @namespace url(http://www.w3.org/1999/xhtml);

  @-moz-document domain("news.ycombinator.com") {
  body {
  width: 960px;
  margin-left: auto;
  margin-right: auto;
  background: #333;
  }
  }