#xmas { width: 500px;  background: #336600; opacity: 0.8; position: fixed; left: 50%; top: 50%;  border:3px solid white; -moz-border-radius: 20px;}
 #xmas a { display: block; padding: 10px 10px; width: 460px;  color: white; font: normal 1em/1.4 Verdana, sans-serif; text-align: center; text-decoration: none;}
  #xmas strong { font-size: 1.4em; }
  #xmas span { display: block; margin-top: 1em; }