.modal_popup_mask {
	position: fixed; /* important */
	top: 0px; /* start from top */
	left: 0px; /* start from left */
	height: 100%; /* cover the whole page */
	width: 100%; /* cover the whole page */
	display: none; /* don't show it */
	/* styling bellow */
	background-color: black;
}

.modal_popup_window {
	position: fixed; /* important so we can position it on center later */
	display: none;
	/* styling bellow */
	background-color: #FFF;
	color: #000;
}

/* style a specific modal window  */
.my_window {
	padding: 50px;
	border: 1px solid gray;
}