.extra {color:black;}
.preview 
{
	float:left;
	text-align:center;
	border:1px solid black;
	padding:1px;
	margin:2px;
	font-size:10px;
	font-family:Arial, Helvetica, sans-serif;
	margin-bottom:5px;
	background-color:#EEEEEE;
	color:black;
}

.preview img
{
	display:block;
	width:140px;
	height:140px;
}
.explicaciones {margin:10px; padding:10px; background:#eee; color:black;}
a.boton {display:block; margin:5px; padding:5px; border:1px solid #666; background:#ddd;color:black; text-decoration:none; width:300px; text-align:center;}
a.boton:hover {border:1px solid #999; background:#eee; color:#666;}