text: $(function() {
  
    // bind vim keys to page scroll
    $(document).bind('keypress', function (e) {
      switch (e.keyCode) {
        case 106:
          window.scrollBy(0, 100);
          break;
        case 107:
          window.scrollBy(0, -100);
          break;
        case 72:
          window.scrollTo(0, 0);
          break;
        case 4:
          window.scrollBy(0, screen.height - 10);
          break;
        case 21:
          window.scrollBy(0, -(screen.height - 10));
          break;
      }
    });
  
  });