Module:If preview/styles.css

.preview-warning {
	font-style: italic;
	font-size: small;
	padding-left: 2em;
	margin-top: 0.8em;
	margin-bottom: 0.8em;
	color: var(--color-error, red);
}

.preview-warning + span.mw-empty-elt + .preview-warning,
.preview-warning + link + .preview-warning {
	margin-top: -0.5em;
}