Template:Large image/styles.css

/**
 * Class: __large_image_container
 *
 * These are the large images that fill the whole container when the container
 * is smaller than the image's native size.
 * This style ensures that the image does not exceed the container width.
 */
.__large_image_container {
	/* center the images in this div if they are smaller than page width */
	text-align: center;
	/** If the container width is constrained, center the div within the parent */
	margin: 0 auto;
}

.__large_image_container img {
	/* thre image must not exceed the parent width */
	max-width: 100%;
	/* maintain aspect ratio when scaling */
	height: auto;
}