Optimize CSS - CookieYes GDPR Cookie Consent

functions.php

<?php 

function wt_cli_add_rel_preload($html, $handle, $href, $media) {
	$preload = array(
		'cookie-law-info',
		'cookie-law-info-gdpr',
		'cookie-law-info-table'
	);
	if (in_array($handle, $preload)) {
		return '<link rel="preload" as="style" onload="this.onload=null;this.rel=' . "'stylesheet'" . '" id="' . $handle . '-css" href="' . $href . '" type="text/css" media="all" />' . "\n";
	}
	return $html;
}
add_filter( 'style_loader_tag', 'wt_cli_add_rel_preload', 10, 4 );