Module:Wide image/styles.css

/* {{pp-template}} */
.wide-image-normbg, .thumbimage.wide-image-normbg {
	background: var(--background-color-neutral-subtle, #f8f9fa);
	color: inherit;
}

.wide-image-nobg, .thumbimage.wide-image-nobg {
	background: transparent;
	color: inherit;
}