.fondecran{ float:left; padding-left:40px; margin-bottom:20px; text-align:center; font-size:13px; }
 .fondecran img{ width:200px; height:150px; }

.sous_fondecran{ clear:both; }

.capture_igoogle{ padding-left:40px; }
 .capture_igoogle img{ width:600px; height:132px; }