script.js

      /* Full screen zoom of question 5 picture*/
      // Get the modal
      var modal = document.getElementById("myModal");

      // Get the image and insert it inside the modal - use its "alt" text as a caption
      var img = document.getElementById("myImg");
      var modalImg = document.getElementById("img01");
      var captionText = document.getElementById("caption");
      img.onclick = function(){
        modal.style.display = "block";
        modalImg.src = this.src;
        captionText.innerHTML = this.alt;
      }

      // Get the <span> element that closes the modal
      var span = document.getElementsByClassName("close")[0];

      // When the user clicks on <span> (x), close the modal
      span.onclick = function() { 
      modal.style.display = "none";
      }