body{
  background-color: #e9e9e9;
  font-family: helvetica;
  font-size: 20px;
  margin: 0px 40px 0px 40px;
}

h1{
  display: block;
/*  width: 330px;*/
  line-height: 50px;
  text-align:center;
  vertical-align:middle;
  background-color: #5DE567;
  border-radius: 10px;
  margin: 10px 10px 10px 10px;
  padding: 20px;
}

h2{
  margin-top: 30px;
  margin-left: 20px;
}

.centre{
  text-align: center;
}

li{
  margin: 10px;
}

.bouton{
  display: block;
  width: 330px;
  line-height: 50px;
  text-align:center;
  vertical-align: middle;
  background-color: #F4B546;
  border-radius: 10px;
  margin-left: auto;
  margin-right: auto;
  margin-top: 50px;
  margin-bottom: 50px;
}

nav{
  background-color: #5DB5E5;
  margin-left: -40px;
  margin-right: -40px;
}