body {
  background-color: black;
  font-family:Helvetica,Arial,sans-serif;
}

img {
  display: block;
  margin: auto;
}

#lien_billetterie {
  color: white;
  text-align: center;
  display: block;
  margin: auto;
  text-decoration: none;
  font-size: 2em;
}