Template:Img/styles.css

/* Resize to fill its container div's width */
.img-maxwidth img {
	max-width: 100%;
	height: auto;
}

/* Dark background for light images with transparent backgrounds */
.img-bgblack {
	background-color: black;
}

/* Convert images to greyscale */
.img-grayscale,
.img-greyscale {
	filter: grayscale(100%);
}