Full width modal with iframe

I want to add the following to a code snippet but it is not working

you can see what it is suppose to do here

https://www.w3schools.com/howto/tryit.asp?filename=tryhow_js_overlay2

Your code snippet functionality does not work like most other similar products

(as an example the visual editor in wordpress)

If you past the code into a code snippet you will see what I mean

Thanks for any help with this

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
body {
font-family: 'Lato', sans-serif;
}
.overlay {
height: 0%;
width: 100%;
position: fixed;
z-index: 1;
top: 0;
left: 0;
background-color: rgb(0,0,0);
background-color: rgba(0,0,0, 0.9);
overflow-y: hidden;
transition: 0.5s;
}
.overlay-content {
position: relative;
top: 8%;
overflow: hidden;
padding-top: 100%
}
.overlay-content iframe {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 78%;
border: 0;
}
.overlay a {
padding: 8px;
text-decoration: none;
font-size: 36px;
color: #818181;
display: block;
transition: 0.3s;
}
.overlay a:hover, .overlay a:focus {
color: #f1f1f1;
}
.overlay .closebtn {
position: absolute;
top: 0;
right: 45px;
font-size: 60px;
margin-top: -5px;
}
@media screen and (max-height: 450px) {
.overlay {overflow-y: auto;}
.overlay a {font-size: 20px}
.overlay .closebtn {
font-size: 40px;
top: 15px;
right: 35px;
}
}
</style>
</head>
<body>
<div id="myNav" class="overlay">
<a href="javascript:void(0)" class="closebtn" onclick="closeNav()">×</a>
<div class="overlay-content">
<iframe frameborder="0" src='https://forms.zohopublic.com/greaterthanthesum/form/ContactForm/formperma/N2N8CmJYyQUPVOgfRQRi1R0iplUGVyEng16Cm1JGpz0'></iframe>
</div>
</div>
<h2>Fullscreen Overlay Nav Example</h2>
<p>Click on the element below to open the fullscreen overlay navigation menu.</p>
<p>In this example, the navigation menu will slide downwards from the top:</p>
<span style="font-size:30px;cursor:pointer" onclick="openNav()">☰ open</span>
<script>
function openNav() {
document.getElementById("myNav").style.height = "100%";
}
function closeNav() {
document.getElementById("myNav").style.height = "0%";
}
</script>
</body>
</html>

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