Custom.js and Style.css are not included in the website - Free Unit

popup.php

function wplms_custom_course_curriculum_free_access_2($html,$lesson,$course_id){
    $free=get_post_meta($lesson,'vibe_free',true);
    if(vibe_validate($free))
      $html ='<a href="'.get_permalink($lesson).'" class="ajax_unit">'.get_the_title($lesson).'</a>';
    ?>

<script>
   jQuery(document).ready(function(){
     jQuery('.ajax_unit').magnificPopup({
            type: 'ajax',
          alignTop: true,
          fixedContentPos: true,
          fixedBgPos: true,
          overflowY: 'auto',
          closeBtnInside: true,
          preloader: false,
          midClick: true,
          removalDelay: 300,
          mainClass: 'my-mfp-zoom-in',
          callbacks: {
            parseAjax: function(mfpResponse) {
               mfpResponse.data = jQuery(mfpResponse.data).find('.unit_wrap');
            },

            ajaxContentAdded: function() {
               // jQuery('video,audio').mediaelementplayer();
                jQuery('.fitvids').fitVids();
                jQuery('.tip').tooltip();
                jQuery('.nav-tabs li:first a').tab('show');
                jQuery('.nav-tabs li a').click(function(event){
                    event.preventDefault();
                  jQuery(this).tab('show');
                });
            }
          }
      });
  });
</script>
<style>.mfp-ajax-holder .mfp-content{max-width:720px;}</style>

  <?php
    return $html;
}