body
{
   width: 831px;
   margin: auto;
   margin-top: 20px;
   margin-bottom: 20px;  
   background-image: url(IMG/fond.jpg);
   color: #FFF;
   
   
}


#en_tete
{
   width: 831px;
   height: 55px;
   margin-bottom: 10px;
   background-image:url(IMG/baniere.png);
   border: 4px ridge;
   color:#FFF;
   
   
   
   
   
}



#menu
{
   float: left;
    width:170px;
	position:fixed;
	
}

.element_menu
{ 
   margin-bottom: 20px;
   
}






.element_menu h3
{    
   
   border: 4px ridge; 
   width:142px;
   height:29px;
   color:#FFF;
}

.element_menu h3 a:hover
{    
   
   color:#FFF;
}

.element_menu h3 img
{    
   
   border:none;
}

.element_menu ol
{
   
   padding: 0px;
   padding-left: 20px;
   margin: 0px;
   margin-bottom: 10px;  
   list-style-type: upper-alpha;
   font-size:14px;
   
   
}

.element_menu li
{
	margin-top: 5px;
	margin-bottom:5px;
}

a
{
  color:#FFF;
}

.element_menu a:hover
{
   color:#FF0;
   font-weight:bold;
}





#corps
{
   margin-left: 165px; 
   margin-bottom: 20px; 
   padding: 5px;  
}

#pied_de_page
{
	margin-top: 100px;
	margin-left:160px;
	text-align: center;
	border: solid;
	width:830;
	
	clear:both;
}

h1
{
	text-align:center;
	
	
}
h2
{
	text-indent:50px;
	text-decoration:underline;
}

table
{
	border-collapse:collapse;
	margin-left:200px;
	
}


td
{	
	border:ridge #CCC;
	padding:5px;
	text-align:center;
}

th
{
	border:ridge #CCC;
	padding:5px;
	text-align:center;
	font-weight:bold;
	font-style:italic;
}

.img_centrale
{
	margin-left: 100px;
	margin-top: 25px;
	border:ridge;
}

.img_equation
{
	border:ridge;
	margin-top: 7px;
	margin-bottom: 7px;
	margin-left: 280px;
}

.img_normale
{
	border:ridge,
}


.tableau_normal
{
	margin-left:0;
	margin-right:0;
 loat:left;
 width: 320px;;
	
}

.tableau_droite
{
	margin-left:0;
	margin-right:0;
	margin-bottom:50px;
	float:right;
	width: 320px;;
	
}

/*.non_flottant
{
	clear:both;
}*/

p
{
	text-indent:20px;
}

.vert
{
	font-weight:normal;
	color:#0F3;
}

.rouge
{
	font-weight:normal;
	color:#F00;
}

.jaune
{
	font-weight:normal;
	color:#FF0;
}