wrapper.appendChild(table);
    }
    // ============================================================


    // ========================== foot notes ======================
    var footNoteRefs = document.querySelectorAll('.footnote-ref');
    var footNoteBackRefs = document.querySelectorAll('.footnote-backref');

    footNoteRefs ? 
    footNoteRefs.forEach(function(elem, idx) {
      elem.onmouseenter = function () {
        if (navbar.classList.contains('scrolling')) {
          navbar.classList.remove('s