section #bouton{
  margin:5% 0;
}
section .btn{
  margin: 20px 40px;
}

.formulaire-BL-BC{
background-color: #D4F5D8;
border:1px solid black;
padding: 50px 0 20px;
margin : 20px 0;
}

.formulaire-BL-BC div{
  margin : 20px 0;
}