* {
  margin: 0;
  padding: 0;
  background-color: transparent;
}
h1 {
  text-align: center;
  font-family: Arial,Helvetica,sans-serif;
  font-size: 200%;
  color: black;
  font-weight: bold;
}
body {
  background-position:  center center;
}
.enveloppe {
  background-position:  center center;
  width: 992px;
  background-repeat: no-repeat;
}
.contenu {
  background-position:  center center;
  width: 800px;
  background-repeat: repeat;
  left: 0px;
  max-width: 800px;
  background-image: url(images/Grand-logo-E-Delta-3d-web.png);
}
.contenu h2 {
  padding-top: 350px;
  font-family: Arial,Helvetica,sans-serif;
  font-size: 120%;
  font-weight: normal;
  text-align: justify;
  padding-right: 50px;
  padding-left: 50px;
}
.contenu h3 {
  font-family: Arial,Helvetica,sans-serif;
  font-size: 80%;
  text-align: center;
  border-top-style: double;
  margin-right: 50px;
  margin-left: 50px;
  margin-top: 50px;
}