#btn{
  
  color:white;
  border-radius: 5px;
  font-family: sans-serif;
  font-size: 14px;
  background-color: #2F4F4F;
  width: 200px;
  height: 50px;
  margin-left: 40%;
  margin-right: 40%;
  text-align: center; 
  
}
#btn:hover{
  background-color: #B22222;
  
}
#tete{
  margin-left: auto;
  margin-right: auto;
}
body{
  font-family: sans-serif;
  
}
fieldset{
  width: 500px;
  margin-left: auto;
  margin-right: auto;
  
  
}
input{
  border-radius:5px;
  display: inline-block;
  

  
}
label{
  width: 150px;
  float: left;
}
#sub{
  border-radius: 10px;
  color:white;
  width: 150px;
  background-color: #2F4F4F;
  
}