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

@-moz-document domain(worlds-highest-website.com) {
  #whws {
    font-size: 10pt !important;
    height: 1em !important;
    line-height: 1.0;
  }
}

/*------------ Note -------------
  You can use
  #whws { display: none; }
  as well, but it will hide
  the ruler.
  ---------- End Note -----------*/