http://userstyles.org/styles/99410/agony-unleashed-forums

userstyle.css

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

@-moz-document url-prefix("https://forums.agony-unleashed.com/index.php") {
  .post.entry-content a, .signature a {
    color: #526175 !important;
  }

  .post.entry-content a:visited, .signature a:visited {
    color: #CC3399 !important;
  }

  .post_wrap {
    font-family: "Open Sans";
  }

  .post.entry-content {
    font-size: 1.4em !important;
  }

  .post_block, .__topic.expandable {
    background-color: #F3F3F3;
  }

  .__topic.expandable {
    border-bottom: 1px solid #dadada;
  }

  #content {
    max-width: 1000px;
    margin: 0 auto;
  }
  
  .post.entry-content {
    line-height: 1.5em;
  }
}