body { font-family: Arial, sans-serif; background: #111; color: #fff; margin: 0; padding: 0; }
.header { text-align: center; padding: 20px; background: #fff; }
.header a.btn-rouge { background: red; color: white; padding: 10px 20px; text-decoration: none; border-radius: 5px; }
.boutons { display: flex; justify-content: center; flex-wrap: wrap; gap: 20px; margin: 30px 0; }
.btn-rouge {
  display: inline-block;
  padding: 15px 30px;
  background-color: red;
  color: white;
  text-decoration: none;
  font-size: 18px;
  border-radius: 8px;
  text-align: center;
}