e button that opens the popup
        var btn = document.getElementById('translateButton');
        // Get the <span> element that closes the popup
        var span = document.getElementsByClassName('close')[0];
        // When the user clicks the button, open the popup 
        btn.onclick = function () {
          popup.style.display = 'block';
        }
        // When the user clicks on <span> (x), close the popup
        span.onclick = function () {
          popup.style.display = 'none';
        }
   