body {
  display:block;
  width: 800px;
  margin-left: auto;
  margin-right: auto;
  margin-top: 0;
  margin-bottom: 0;
  padding: 0;
  font-family: sans-serif;
}

#entete {
  margin : 0;
  height: 100px;
  background: #999999;
}

#titre-principal {
  Display: none ;
  margin: 0;
  Color: white;
  text-align: center;
  height:100px;
  line-height:100px;
  font-family: sans-serif;
  font-size: 50px 
}

#gauche {
  float: left;
  width: 30%;
}

#droite {
  float: right;
  width: 68% ;
}

img {
  width: 100%;
  height: auto;
  border: 0;
  margin : 0;
  padding: 0;
}

.gras {
  font-weight: bold;
}
#bloc{
  display: inline-block;
  padding-bottom: 10px;
  margin-top: 10px;
  border-width : 0 0 1px 0 ;
  border-color: #999999;
  border-style: solid;
  width: 100%;
  height: 100%;
}