Headers and Footers don’t work

Hi. In my gallery pages I have a btn (X) that closes the gallery. After the latest update of Elementor and WP it doesn’t work anymore. Here’s the code:

<script type="text/javascript"> 
 
jQuery(document).ready(function() {
    jQuery('#btn-back').on('click', function() {
      window.history.go(-1); 
      return false;
    });
});
 
</script>

<script type="text/javascript"> 
 
jQuery(document).ready(function() {
    jQuery('#btn-back2').on('click', function() {
      window.history.go(-1); 
      return false;
    });
});
 
</script>

The page I need help with: [log in to see the link]