body {
	color : #ffffff;
	background : #333333;
	position : absolute;
	margin-left : -320px;
	margin-top : -240px;
	width:640px;
	height:480px;
	left:50%;
	top:50%;
	text-align: center;
}
#logo {
	position : absolute;
	margin-left : -320px;
	margin-top : -240px;
	width:640px;
	height:480px;
	left:50%;
	top:50%;
	text-align: center;
}
#logo img {
	-webkit-transition: opacity 0.2s linear;
	opacity:0.9;
}
#logo img:hover {
	-webkit-transition: opacity 0.2s linear;
	opacity:1;
}
#toolbar {
	width:700px;
	margin:0 auto 0 auto;
}
.bouton {
	float:left;
	opacity:0.7;
	-webkit-transition: opacity 0.2s linear;
}
.bouton:hover {
	opacity:1;
	-webkit-transition: opacity 0.2s linear;
	border-bottom:2px solid white;
}
a img {
	border: none;
}