body
{
   width: 100%;
   margin: auto; 
   margin-top: 2px; 
   margin-bottom: 20px;
}

#principal
{
position : absolute;
   top: 0%;
   left : 0px;
   width: 100%;
   height: 92%;
   border-style : ridge;
   background-color : #A6D1F9;
   background-repeat:repeat;
   overflow-y:scroll;
   overflow-x:scroll;
  }

#pied_page
{
position : absolute;
   top: 92%;
   left : 0px;
   width: 100%;
	height: 6%;
	border-style : ridge;
   background-color : #00c0c0;
   overflow : hidden;
}