gistfile1.css

@media (max-width: 767px) {
    // cribbed from http://ansciath.tumblr.com/post/7347495869/css-aspect-ratio
	// and also #comment-764668376 on that page. Horrifying CSS.
	#map-container {
		display: inline-block;
		position: relative;
	}

	#map-container:before {
		content: "";
		display: block;
		padding-top: 75%;
	}
	
	svg.map {
		position: absolute;
		top: 0;
		bottom: 0;
		left: 0;
		right: 0;
		width: 100%;
		height: 100%;
	}
}