html, body {
	padding: 0px;
	margin: 0px;
	background-color: #000;
}
.pic_big {
	max-width: 100%;
	max-height: 100%;
	position: absolute;
	left: 50%;
	top: 50%;
	-webkit-transform: translate(-50%, -50%);
	-ms-transform: translate(-50%, -50%);
	transform: translate(-50%, -50%);
}