functions.php

<?php
//* Do NOT include the opening php tag shown
add_filter(
	'wfea_cal_event_extra_options',
	function ( $options ) {
		$title = get_the_title();
		if (preg_match('/securing/i',$title) ) {
			$options['backgroundColor'] = 'red';
			$options['borderColor'] = 'black';
			$options['textColor'] = 'white';
		} else if (preg_match('/A Test/i',$title) ) {
			$options['backgroundColor'] = 'green';
			$options['borderColor'] = 'black';
			$options['textColor'] = 'yellow';
		}
		return $options;
	},
	10,
	1
);