.baniere{
  background-image: url("../img/baniere mlle.jpg");
  background-size: auto;
}

.centrer{
  display: block;
  margin-left: auto;
  margin-right: auto;
}

.justify{
  text-align: justify;
}

.bottom{
  margin-bottom: 5%;
}

.top{
  margin-top: 8%;
}