I propose minor change

Hi!

I like Your plugin. I changed code:

I commented out preloader_plugin_active and add_action( ‘init’, ‘preloader_plugin_active’ );

and:

/* HTML Content */
function preloader_main_content () {
?>
<div id="loading">
.....
.....
<?php

// * Inline script *
add_action('wp_head', function () {
?>
<script>
jQuery(window).load(function() {
	jQuery("#loading-center").delay('fast').fadeOut(600);
	jQuery("#loading").delay('slow').fadeOut(800);
});
</script>
<?php
}, 12);
}