.jumbotron
{
	background: #d5d5d5 url(../images/portada22.jpg) no-repeat center center;
	min-height: 486px;
}

.thumbnail
{
	text-align: center;
}

.thumbnail a>img, .thumbnail img
{
	display: inline-block;
	margin-top:5px;
	margin-bottom: 5px;
	
}