body{
  font-family: 'time new roman';
  font-size: 15px;
  margin: 0px;
  padding: 0px;
  background-color: #222020;
}

/* mise en forme bar titre */

header{
  width: 30%;
  padding: 5px;
  margin: 0 auto;
  margin-top: 15px;
  justify-content: center;
  border: solid #f78401;
  border-radius: 30px;
  background-color: rgba(000, 112, 192, 0.15);
}

header h1{
  color: #ffffff;
  font-size: 50px;
  margin-top: 0px;
  margin-bottom: auto;
  text-align: center;
  font-weight: normal;
}

header h2{
  color: #ffff00;
  font-size: 17px;
  margin-top: auto;
  margin-bottom: 0px;
  font-weight: normal;
  text-align: center;
}

/* mise en forme bar theme */

.theme{
  display: table;
  margin: 0 auto
}

nav ul{
  margin: 0px;
  padding: 0px;
}

nav li{
  text-align: center;
  list-style-type: none;
  border-radius: 30px;
  margin-top: 20px;
  margin-bottom: 20px;
}

nav a{
  color: #fff;
  font-size: 25px;
  font-weight: bold;
  margin: 10px 30px;
  font-weight: normal;
  display: inline-block;
  text-decoration: none;
}

/* mise en forme pied de page */

footer{
  width: 80%;
  font-size: 20px;
  margin: 0 auto;
  text-align: center;
  padding-top: 5px;
  border-radius: 5px;
  padding-bottom: 5px;
  background-color: grey;
}

@media screen and (max-width: 780px){

  header{
    width: 50%;
    padding: 5px;
    margin-top: 10px;
    border: 2px solid #f78401;
    border-radius: 20px;
  }
  
  header h1{
    font-size: 25px;
    text-align: center;
  }
  
  header h2{
    font-size: 8px;
  }

/* mise en forme bar theme */

  nav li{
    border-radius: 30px;
    margin-bottom: 10px;
 }

  nav a{
    font-size: 15px;
 }

  footer{
    width: 100%;
    font-size: 14px;
    margin-top: 3px;
    padding-top: 3px;
 }

}