Editing Template:Citation/styles.css

/* {{pp|small=y}} */
/*
 * This page is a convenient place for the "citation" styles that are
 * available in many of our citation templates. This page can be considered the
 * authoritative source for those styles. [[Template:Citation]], like all CS1/2
 * templates, is styled from [[Module:Citation/CS1/styles.css]], *not* here.
 */
/* Break long urls, etc., rather than overflowing box */
.citation {
	word-wrap: break-word;
}

/* Highlight linked elements (such as clicked references) in blue */
.citation:target {
	/* ignore the linter - all browsers of interest implement this */
	background-color: rgba(0, 127, 255, 0.133);
}