Geeks - display footer in single lesson page

functions.php

 function page_footer( $disabled ) {
			global $post;
			$student_register_page_id    = (int) tutor_utils()->get_option( 'student_register_page' );
			$has_content_access          = tutils()->has_enrolled_content_access('lesson');
			$instructor_register_page_id = (int) tutor_utils()->get_option( 'instructor_register_page' );
			$post_id                     = isset( $post->ID ) ? $post->ID : false;
			$parents                     = get_post_ancestors( $post_id );
    		$course_id                   = ($parents) && ! empty( $parents )  ? $parents[count($parents)-1]: $post_id;
			$is_course_public            = get_post_meta( $course_id, '_tutor_is_public_course', true );
			$_is_preview                 = get_post_meta( $post_id, '_is_preview', true );

			if ( is_page( $student_register_page_id ) || is_page( $instructor_register_page_id ) ) {
				$disabled = true;
			}

			if ( (  'yes' === $is_course_public || $_is_preview ) && !is_archive() && ! is_single_course() ) {
				$disabled = true;
			}


			return $disabled;
		}

style.css

   .single-lesson .footer-v1 ,
   single-quiz .footer-v1 , 
   single-assignment .footer-v1  {
    position: fixed;
    bottom: 0;
    width: 100%;
    background: #fff;
    padding: 10px;
    }