body {
	width: 100%;
	height: 100vh;
	margin: 0;
}
#main {
	height: 100vh;
	margin: auto;
	text-align: center;
}

img {
	height: 100vh;
}
@media screen and (max-width: 700px) {
	body {
		width: 100%;
		height: auto;
		margin: 0;
	}
	#main {
		height: auto;
		margin: 50% 10% 0;
		text-align: center;
	}
	img {
		width: 100%;
		height: auto;
	}
}