#presentation_main{
	font-size:1.25em;
	float: left;
	width:570px;
	font-family:Arial,sans-serif;
	padding:0;
	
}
#presentation_main_logo{
	float:left;
	width:570px;
	height:100%;
	margin: 0 0 20px 0;
}
#presentation_main_logo img{
	float:left;
	width: 546px;
}
#presentation_main_col_gauche{
	float:left;
	width:395px;
	height:100%;
	font-size:1em;
	margin: 10px 5px 0 0;
}
#presentation_main_col_droite{
	float: left;
	width: 145px;
	margin: 0 25px 50px 0;
}
#presentation_main_col_droite img{
	float: right;
	margin: 0 0 10px 0;
}
#presentation_main_contact{
	float: left;
	width: 300px;
	font-size:1.1em;
}
#presentation_main_contact a{
	width: 300px;
	text-decoration: none;
	color: #000000;
}
#presentation_main_contact a:hover{
	text-decoration: underline;
}
#presentation_main_bouton{
	float: left;
	width: 245px;
	height: 150px;
	margin: 0 25px 0 0;
	text-align:center;
	position:relative;
}
#presentation_main_bouton a{
	float: right;
	width:130px;
	background-color:#666666;
	color:#ffffff;
	margin: 0 0 10px 0;
	position:absolute;
	right:0;
	bottom:0;
}