How To Create An Overlay Effect - W3Schools

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Learn how to create an overlay effect with CSS.

Overlay

Learn how to create an overlay effect:

Overlay Click anywhere to turn off the overlay effect Turn on the overlay effect

How To Create an Overlay Effect

Step 1) Add HTML:

Use any element and place it anywhere inside the document:

Example

<div id="overlay"></div>
Step 2) Add CSS:

Style the overlay element:

Example

#overlay { position: fixed; /* Sit on top of the page content */ display: none; /* Hidden by default */ width: 100%; /* Full width (cover the whole page) */ height: 100%; /* Full height (cover the whole page) */ top: 0; left: 0; right: 0; bottom: 0; background-color: rgba(0,0,0,0.5); /* Black background with opacity */ z-index: 2; /* Specify a stack order in case you're using a different order for other elements */ cursor: pointer; /* Add a pointer on hover */}
Step 3) Add JavaScript:

Use JavaScript to turn on and off the overlay effect:

Example

function on() { document.getElementById("overlay").style.display = "block";}function off() { document.getElementById("overlay").style.display = "none";} Try it Yourself »

Overlay Effect with Text

Add anything you want inside the overlay, and place it where you want. In this example we add text in the middle of the page:

Example

<style>#text{ position: absolute; top: 50%; left: 50%; font-size: 50px; color: white; transform: translate(-50%,-50%); -ms-transform: translate(-50%,-50%);}</style><div id="overlay"> <div id="text">Overlay Text</div></div> Try it Yourself » ❮ Previous Next ❯ ★ +1 Sign in to track progress

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