html, body {
	position: relative;
	width: 100%;
	height: 100%;
}

.wrapper { 
	width: 900px; 
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
}

@media only screen and (max-width: 600px) {

	.wrapper { 
		width: auto;
		position: relative;
		transform: none;
		left: 0;
		margin-top: 10px;
		top: 0;
	}
	
}