body {
  font-family: arial;
}
header {
  height:200px;
  background-image: url('../images/photo.jpg');
  background-size: cover;
  background-position: center center;
}
h3 {
  text-align: center;
}
form {
  margin:20px auto;
  padding:10px;
  background-color: rgb(240,240,248);
  width:650px;
}
form input, form div {
  display:block;
  margin:10px auto;
  height:30px;
  width:400px;
  padding:0 5px;
}
form div label {
  display: inline-block;
}
form div input[type=radio] {
  display: inline-block;
  width:20px;
  margin:5px;
}
form input[type=button], .bouton {
  background-color: rgb(140,140,150);
  color:white;
  cursor:pointer;
  transition: 0.25s background-color;
  border:0;
  border-radius: 4px;
}
form input[type=button]:hover {
  background-color: rgb(150,150,180);
}
form input[type=file] {
  display:none;
}