body {
	color: #000000;
	background-color: white;
	margin:0px;
	padding:0px;
	vertical-align: middle;
	font-family: Verdana, Georgia, Sans-serif;
	font-size: 0.8em;
}
#contenu {
width: 570px;
height:  400px;
position: absolute;
left: 50%;
top: 50%;
margin-left: -285px; /* moitié de width */
margin-top: -257px; /* moitié de height */

}

#twitter{height:264pt;overflow:auto}