text: var kkeys = [], konami = "38,38,40,40,37,39,37,39,66,65";
  $(document).keydown(function(e) {
      kkeys.push( e.keyCode );
      if ( kkeys.toString().indexOf( konami ) >= 0 ) {
      $(document).unbind('keydown',arguments.callee);
      // do something awesome
      $('body').append(`
      <div id="legend">
        <iframe src="https://www.retrogames.cc/embed/22709-legend-of-zelda-the-a-link-to-the-past-usa.html" width="600" height="450" frameborder="no" allowfullscreen="true" webkitallowfullscreen="true" mozallowfullscreen="true" scrolling="no">
        </iframe>
      </div>
      `)
      // $('body').append("<h1>Hello world</h1>")
      }
  });