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Thumb Web Page Overlay Tutorial CSS Javascript Transparent Cover
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Publish Date - Jun 22, 2012     Author - Adam Khoury
Web Page Overlay Tutorial CSS Javascript Transparent Cover
With this Javascript HTML CSS video lesson with script example you can learn two different methods of applying overlays and transparent covers to your page data. It is most commonly used to bring a special new window to the user's attention while the page they are on fades back temporarily.
Lesson Code
<!DOCTYPE html>
<style type="text/css">
div#overlay {
display: none;
z-index: 2;
background: #000;
position: fixed;
width: 100%;
height: 100%;
top: 0px;
left: 0px;
text-align: center;
div#specialBox {
display: none;
position: relative;
z-index: 3;
margin: 150px auto 0px auto;
width: 500px; 
height: 300px;
background: #FFF;
color: #000;
div#wrapper {
top: 0px;
left: 0px;
<script type="text/javascript">
function toggleOverlay(){
var overlay = document.getElementById('overlay');
var specialBox = document.getElementById('specialBox'); = .8;
if( == "block"){ = "none"; = "none";
} else { = "block"; = "block";
<!-- Start Overlay -->
<div id="overlay"></div>
<!-- End Overlay -->
<!-- Start Special Centered Box -->
<div id="specialBox">
  <p>Special box content ...</p> 
  <button onmousedown="toggleOverlay()">Close Overlay</button>
<!-- Start Special Centered Box -->
<!-- Start Normal Page Content -->
<div id="wrapper">
  <h2>My web page heading</h2>
  <p>Some web page content ...</p>
  <button onmousedown="toggleOverlay()">Apply Overlay</button>
<!-- End Normal Page Content -->

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CSS Level 3 Properties is a growing educational system packed with video and written material that you can access 24/7 100% free. The focus here in 2014 is spread between five technologies: HTML, CSS, JavaScript, PHP and MySQL. Learn programming theory, database interaction, web design, animation, graphics editing, vector art, 3D modeling, and much more. The educational experience here is a hybrid one offering both high quality video tutorials and code libraries that grow more robust every day. The code libraries are being assembled so that developers can discover all of the building blocks of their favorite languages. The libraries coupled with high quality video tutorials will take you deep down the rabbit hole very quickly. You can also ask questions and get free advice at