Custom popup using html css & js

Copy and Paste the following code for creating a custom popup with html/css and js or download the file click here

<html>
<head>
<title> Popup</title>
<style>
.kkduniya_modal {
display: none;
position: fixed;
z-index: 1;
left: 0;
top: 0;
width: 100%;
height: 100%;
overflow: auto;
background-color: #050303cf;
}

.kmodal-content {
position: relative;
margin: auto;
padding: 0;
width: 80%;
top: 30%;
box-shadow: 0px 0px 11px 2px #0000001c;
animation-name: animatetop;
animation-duration: 0.4s
}

/* The Close Button */
.kmodal_close {
float: right;
font-size: 28px;
font-weight: bold;
}

.kmodal_close:hover,
.kmodal_close:focus {
color: #000;
text-decoration: none;
cursor: pointer;
}

.kmodal-header {
padding: 5px 10px;
background: #f3f3f3;
}

.kmodal-body {
padding: 2px 16px;
background: #fff;
}

.kmodal-footer {
padding: 25px 16px;
background: #f3f3f3;
}
#footer_kmodal_close{
float: right;
}
</style>
</head>
<body>


<div class="container">
<div id="kmodal" class="kkduniya_modal">
<div class="kmodal-content">
<div class="kmodal-header">
<span class="kmodal_close" id="kmodal_close">×</span>
<h3>Modal Header Area</h3>
</div>
<div class="kmodal-body">
<p> Modal Body Content Area</p>
</div>
<div class="kmodal-footer">
<span>Modal Footer Area</span>
<button class="close_btn" id="footer_kmodal_close">Close</button>
</div>
</div>

</div>
</div>

<button class="popupbtn" id="popupbtn">Modal</button>
</body>

<script type="text/javascript">

var btnElement = document.getElementById("popupbtn");
var modalElement = document.getElementById("kmodal");

btnElement.onclick = function() {
modalElement.style.display = "block";
}

var closeElement = document.getElementById("kmodal_close");
var footercloseElement = document.getElementById("footer_kmodal_close");
closeElement.onclick = function() {
modalElement.style.display = "none";
}

footercloseElement.onclick = function() {
modalElement.style.display = "none";
}

</script>
</html>