a.bouton2 {
padding: 10px 30px; 
background: blue; 
color: white; 
  text-decoration:none;
  border-radius: 30px;
  text-align: center;
  font-size: 20px;
 -webkit-transition: all 0.5s;
 -moz-transition: all 0.5s;
 -o-transition: all 0.5s;
  transition: all 0.5s;
  cursor: pointer;
  margin: 5px; 
    
    
}