body
{
   width: 100%;
   height: 100%;
   margin: auto; 
   margin-top: 0px; 
   margin-bottom: 20px;
   overflow : hidden;
}

#en_tete
{
position : absolute;
   top : 0px;
   left : 0px;
   width: 100%;
   height: 11%;
   margin-bottom: 2px;
   border-style : ridge;
   overflow : hidden;
  
}


#gauche
{
position : absolute;
   top : 11%;
   left : 0px;
   width: 20%;
   height: 82%;
   margin-bottom: 2px;
   border-style : ridge;
   background-image:url(fd_ciel.jpg);
   overflow : hide;
  
}

#principal
{
position : absolute;
   top: 11%;
   left : 20%;
   width: 60%;
   height: 82%;
   border-style : ridge;
   overflow : scroll;
   
}

#droite
{
position : absolute;
   top : 11%;
   left : 80%;
   width: 20%;
   height: 82%;
   margin-bottom: 2px;
   border-style : ridge;
   background-image:url(fd_ciel.jpg);
   overflow : hide;
  
}




#pied_page
{
position : absolute;
   top: 93%;
   left : 0px;
   width: 100%;
	height: 7%;
	border-style : ridge;
   background-color : #00c0c0;
   overflow : hidden;
}