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Hello oskargrzyb,

Add below php code into your current active child theme’s functions.php file or you can use Code Snippets plugin for use below php code.

add_action('wp_footer', 'custom_script');
function custom_script() {
  ?><script type="text/javascript">
    jQuery(window).load(function() {
      jQuery('#preloader-background').hide();
    });
  </script><?php
}

Hope this will helps you.

Thanks.