Template:Ruby/styles.css

ruby > rt {
    font-feature-settings: 'ruby' 1;
	/* font-size: 85% is a [[WP:ACCESS]] issue. Don't change without discussion
	 * at [[WT:ACCESS]]. */
    font-size: 65%;
}

ruby.large {
    font-size: 250%;
}

ruby.large > rt {
    font-size: 50%;
}