html, body {
 margin: 0;
 padding: 0;
 }
body {
 
background: url("/images/background.jpg") no-repeat center center fixed; 
  -webkit-background-size: cover;
  -moz-background-size: cover;
  -o-background-size: cover;
  background-size: cover;



 font-family: Verdana, sans-serif; 
 font-size: 100%;
 }


#container{
    position: relative;
    text-align: center;
    margin-top: -150px;

}

.btn {
  background: #223847;
  background-image: -webkit-linear-gradient(top, #223847, #2980b9);
  background-image: -moz-linear-gradient(top, #223847, #2980b9);
  background-image: -ms-linear-gradient(top, #223847, #2980b9);
  background-image: -o-linear-gradient(top, #223847, #2980b9);
  background-image: linear-gradient(to bottom, #223847, #2980b9);
  -webkit-border-radius: 10;
  -moz-border-radius: 10;
  border-radius: 10px;
  font-family: Arial;
  color: #ffffff;
  font-size: 20px;
  padding: 10px 20px 10px 20px;
  border: solid #e9f723 2px;
  text-decoration: none;
}

.btn:hover {
  background: #031621;
  background-image: -webkit-linear-gradient(top, #031621, #3498db);
  background-image: -moz-linear-gradient(top, #031621, #3498db);
  background-image: -ms-linear-gradient(top, #031621, #3498db);
  background-image: -o-linear-gradient(top, #031621, #3498db);
  background-image: linear-gradient(to bottom, #031621, #3498db);
  text-decoration: none;
}

h1 {
 font-size: 200%; 
 color: navy; 
 text-align: center;
 }
h2 {
 font-size: 150%; 
 color: red; 
 padding-left: 15px;
 }
p,ul,li,td {
 color: black; 
 }
a:link {
 color: green;
 text-decoration: underline;
 }
a:visited {
 color: gray;
 }
a:hover {
 color: red;
 text-decoration: none;
}
a:active, a:focus {
 color: red;
}

#logo{
    display: flex;

    justify-content: center;
    max-width: 90%;
  margin: 0 auto;
    margin-top: 50vh;
    transform: translateY(-50%);}

#logoenfant{margin:auto;}

.imglogo{
    width: 100%;
    margin: 0 auto;
    position: relative;
}

@media only screen 
and (min-device-width : 375px) 
and (max-device-width : 667px) 
and (orientation : landscape) { 

#logo{
    display: flex;
    flex-direction: column;
    justify-content: center;
    max-width: 50%;
  margin: 0 auto;
    margin-top: 50vh;
    transform: translateY(-50%);}

}