How to Create an Overlay Effect?

Overview

CSS as we all know is used to make websites look good. It has many tricks up its sleeve that enable us to do so. An overlay is one such thing. Overlay means covering the surface of an element. You must have encountered them when visiting a website. Many websites have a popup with some form, advertisement, etc, these are examples of an overlay.

In this article, you will learn how to create overlays in CSS.

Pre-requisites

To create an overlay in CSS you should have basic knowledge of

CSS positions
:hover

That's it. Let's learn how to create CSS overlays.

CSS Overlay Syntax

Here is the syntax that will create a CSS overlay.

Let's move to a detailed break down of the syntax in the next section.

Basic Example

For an overlay CSS to work properly we need some JavaScript also. This example will explain to you how HTML, CSS, and JavaScript can be linked together to create an overlay.

The example we will see below illustrates the concept of overlay using a single HTML file that contains both JS and CSS, but we can separate them into different files, and that will also work just fine.

First, let's start with the HTML part:

Output

CSS OVERLAY SYNTEX

CSS

In place of position:fixed we can also use position:absolute both will work. With position absolute, we have to specify the top/left/right positions.

JavaScript

These two functions are responsible for showing and hiding the overlay CSS. The function changes the display property of the element.

So after combining HTML, CSS, and JavaScript, your output will look like this:

Output: BASIC OVERLAY

How to Create Different Overlay Effects?

Fade Overlay Effect

In this effect, an overlay is displayed when we hover over the image.

HTML

CSS

Output: FADE OVERLAY

Image Overlay Slide

Four types of sliding effects can be created using a CSS overlay, these are top, bottom, left, and right.

Let's look at them one by one-

Slide in Overlay from Top to Bottom

Here the overlay will appear from the top and will continue to the bottom.

HTML

CSS

Output: TOP TO BOTTOM

Slide in Overlay from Bottom to Top

Output: BOTTOM TO TOP

Slide in Overlay from Left to Right

HTML

CSS

Output: LEFT TO RIGHT OVERLAY

Slide in Overlay from Right to Left

HTML

CSS

Output: RIGHT TO LEFT OVERLAY

Image Overlay Title

HTML

CSS

Output: OVERLAY TITLE

Image Overlay Icon

For icon, we are using Font-Awesome. To make that work we will insert this link tag in the <Head> section of the HTML

HTML

CSS

Output:

Conclusion

Till now you must have learned

Overlay means covering the surface of an element.
HTML, CSS, and JavaScript can be linked together to create an overlay.
The CSS overlay can be triggered by elements when we hover over them or we could also make separate buttons to trigger the overlay.
We could also display text in the CSS overlay and make them slide as we show in the above examples.