.modal{
	position:fixed;
	top:0;
	left:0;
	width:100%;
	height:100%;
	background-color:rgba(0,0,0,.7);
	display:none;
	z-index: 2000;
}

.ventana{
	width:500px;
	position:absolute;
	top:15%;
	left:50%;
	margin-left:-200px;
}

.ventana img{
	width:100%;
	border:3px solid #fff;
}

.ventana span{
	color:#fff;
	background-color:#000;
	padding:.2em .6em .3em .6em;
	font-family:Arial;
	font-weight:bold;
	border:2px solid #fff;
	border-radius:50%;
	position:absolute;
	top:-15px;
	right:-20px;
	cursor:pointer;
}

@media only screen and (max-width: 40em) {
.ventana{
	width:90%;
	position:relative;
	top:15%;
	left:50%;
	margin-left:-170px;
}

.ventana img{
	width:100%;
	border:3px solid #fff;
}

	

}