Mettre une croix de fermeture à une iframe

Re-bonjour,

j'ai trouvé un moyen sur W3School pour mes 2 interrogation : il suffit d'enrober l'iframe avec des div qui gérent l'aspect modal et la fermeture. Voici le code :

HTML

Code:

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<div id="myModal" class="modal">
  <div class="modal-content">
    <span class="close">&times;</span>
    <iframe src="https://www.google.com          
/maps/embed?pb=!1m18!1m12!1m3!1d2892.8751164585487!2d5.431906915930273!3d43.525796879125814!2m3!1f0!2f0!3f0!3m2!1i1024!2i768!4f13.1!3m3!1m2!1s0x12c98d750ec6c101%3A0x7b0af995b191f5e8!2s4+Square+Edouard+Peisson%2C+13100+Aix-en-Provence!5e0!3m2!1sen!2sfr!4v1489605178454" width="800" height="600" frameborder="0" allowfullscreen class="iframe" style="vertical-align:middle;"></iframe>
   </div>
</div>

CSS:

Code:

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 /* The Modal (background) */
.modal {
    display: none; /* Hidden by default */
    position: fixed; /* Stay in place */
    z-index: 1; /* Sit on top */
    left: 0;
    top: 0;
    width: 100%; /* Full width */
    height: 100%; /* Full height */
    overflow: auto; /* Enable scroll if needed */
    background-color: rgb(0,0,0); /* Fallback color */
    background-color: rgba(0,0,0,0.4); /* Black w/ opacity */
}
 
/* Modal Content/Box */
.modal-content {
    background-color: #fefefe;
    margin: 15% auto; /* 15% from the top and centered */
    padding: 20px;
    border: 1px solid #888;
    width: 80%; /* Could be more or less, depending on screen size */
}
 
/* The Close Button */
.close {
    color: #aaa;
    float: right;
    font-size: 28px;
    font-weight: bold;
}
 
.close:hover,
.close:focus {
    color: black;
    text-decoration: none;
    cursor: pointer;
}

JAVASCRIPT:

Code:

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// Get the modal
var modal = document.getElementById('myModal');
 
// Get the button that opens the modal
var btn = document.getElementById("myBtn");
 
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
 
// When the user clicks on the button, open the modal
btn.onclick = function() {
    modal.style.display = "block";
}
 
// When the user clicks on <span> (x), close the modal
span.onclick = function() {
    modal.style.display = "none";
}
 
// When the user clicks anywhere outside of the modal, close it
window.onclick = function(event) {
    if (event.target == modal) {
        modal.style.display = "none";
    }
}