.main-content {
	height: 800px;
	width: 1000px;
	margin: 0 auto;
}

.overlay-bg {
	display: none;
	position: absolute;
	top: 0;
	left: 0;
	height:100%;
	width: 100%;
	cursor: pointer;
	z-index: 1000; /* high z-index */
	background: #000; /* fallback */
	background: rgba(0,0,0,0.75);
}
	.overlay-content {
	display: none;
	background: #fff;
	padding: 1%;
	width: 25%;
	position: absolute;
	top: 15%;
	left: 60%; /* add negative left margin for half the width to center the div */
	cursor: default;
	z-index: 10001;
	border-radius: 4px;
	box-shadow: 0 0 5px rgba(0,0,0,0.9);
	margin-top: 20%;
	margin-right: 0;
	margin-bottom: 0;
	margin-left: -20%;
	font-family: "Palatino Linotype", "Book Antiqua", Palatino, serif;
	color: #464646;
	}

	.close-btn {
	cursor: pointer;
	border: 1px solid #333;
	border-radius: 4px;
	box-shadow: 0 0 4px rgba(0,0,0,0.3);
	background-color: #b0ed88;
	margin-top: 10px;
	padding-top: 2%;
	padding-right: 5%;
	padding-bottom: 2%;
	padding-left: 5%;
	}
	.close-btn:hover {
	background: #fcf699;
	}

/* media query for most mobile devices */
@media only screen and (min-width: 0px) and (max-width: 480px){

	.overlay-content {
		width: 96%;
		margin: 0 2%;
		left: 0;
	}
}