adding expand all option in curriculum

add_action('wplms_course_curriculum_section', function() {

    $course_id = get_the_ID();
    $course_curriculum = bp_course_get_curriculum($course_id);
    if(!empty($course_curriculum)){
      $duration = 0;
      $lecture = 0;
      foreach($course_curriculum as $key => $item){   
        if(is_numeric($item)){ 
          $post_type = get_post_type($item);
          if( $post_type == 'unit' && function_exists('bp_course_get_unit_duration')){
            $duration += bp_course_get_unit_duration($item);
            $lecture += 1;
          }else if($post_type == 'quiz' && function_exists('bp_course_get_quiz_duration')){
            $duration += bp_course_get_quiz_duration($item);
          }
        }
      }

      if(function_exists('tofriendlytime')){
        $duration = apply_filters('wplms_cs_get_course_unit_durations',tofriendlytime($duration),$duration);
      }

    echo '
    <style>
      .course_curriculum .add_custom_expand{
        grid-template-columns: 1fr 1fr 1fr;
        display: grid;
      }
      .course_curriculum .add_custom_expand .collapse_all {display: none;}
    </style>
    <div class="add_custom_expand">
      <a class="expand_all" href="javascript:void(0)" >Expand All</a>
      <a class="collapse_all" href="javascript:void(0)" >Collapse All</a>
      <span class="lecture_count">'.$lecture.' Lectures</span>
      <span class="total_duration" >'.$duration.'</span>
    </div>';

?>
    <script>
      jQuery(document).ready(function($) {
        $(".course_curriculum .expand_all").click(function() {
          $(".course_curriculum .course_section").addClass('show');
          $(".course_curriculum .course_lesson").addClass('show');
          $(".course_curriculum .add_custom_expand .collapse_all").show();
          $(".course_curriculum .add_custom_expand .expand_all").hide();
        });
        $(".course_curriculum .collapse_all").click(function() {
          $(".course_curriculum .course_section").removeClass('show');
          $(".course_curriculum .course_lesson").removeClass('show');
          $(".course_curriculum .add_custom_expand .collapse_all").hide();
          $(".course_curriculum .add_custom_expand .expand_all").show();
        });
      });
    </script>

<?php
}
});