div.dokuwiki {
  margin: auto;
  width: 981px;
}
div.header {
  background-image: url('http://www.rpg-le-jeu.com/common/images/header_1.png');
  height: 142px;
  width: 981px;
}
div.header a {
  display: block;
  height: 142px;
  width: 981px;
}