Launching modal from mega menu

I want to launch a modal with our FAQ answers in the GET ANSWERS portion of the menu.

All of my code works when I apply it on a page, to trigger a modal on image click. When I put the HTML in the mega menu (custom html) and the CSS in the theme, the JS doesn’t seem to take to trigger the modal. Not sure where I should place it.

This is my code, which worked when tested outside of the mega:

MODAL HTML

<img id="myImg" src=" https://www.superspringsinternational.com/wp-content/uploads/SumoSuper.png" style="width:100%;max-width:300px">

<!-- The Modal -->
<div id="myModal" class="modal">

  <!-- The Close Button -->
  <span class="close">&times;</span>

  <!-- Modal Content (The Image) -->
  <img src=" https://www.superspringsinternational.com/wp-content/uploads/SumoSuperA.png">

  <!-- Modal Caption (Image Text) -->
  <div id="caption"></div>
</div>

MODAL CSS

/* Style the Image Used to Trigger the Modal */
#myImg {
  border-radius: 0px;
  cursor: pointer;
  transition: 0.3s;
  height: 500px;
}

#myImg:hover {opacity: 0.7;}

/* The Modal (background) */
.modal {
  display: none; /* Hidden by default */
  position: fixed; /* Stay in place */
  z-index: 99999; /* Sit on top */
  padding-top: 100px; /* Location of the box */
  left: 20%;
  right: 12%;
  top: 0;
  width: 75%; /* Full width */
  height: 75%; /* Full height */
  overflow: auto; /* Enable scroll if needed */
  background-color: rgb(0,0,0,0.0); /* Fallback color */
  background-color: rgba(0,0,0,0.0); /* Black w/ opacity */
}

/* Modal Content (Image) */
.modal-content {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
}

/* Caption of Modal Image (Image Text) - Same Width as the Image */
#caption {
  margin: auto;
  display: block;
  width: 80%;
  max-width: 700px;
  text-align: center;
  color: #ccc;
  padding: 10px 0;
  height: 150px;
}

/* Add Animation - Zoom in the Modal */
.modal-content, #caption {
  animation-name: zoom;
  animation-duration: 0.6s;
}

@keyframes zoom {
  from {transform:scale(0)}
  to {transform:scale(1)}
}

/* The Close Button */
.close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: #202b5b;
  font-size: 40px;
  font-weight: bold;
  transition: 0.3s;
}

.close:hover,
.close:focus {
  color: #bbb;
  text-decoration: none;
  cursor: pointer;
}

/* 100% Image Width on Smaller Screens */
@media only screen and (max-width: 700px){
  .modal-content {
    width: 100%;
  }
}

MODAL JS:

// 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";
}

The page I need help with: [log in to see the link]