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Previous Next Chapter CSS Image Opacity / Transparency

Creating transparent images with CSS is easy.

Note:The CSS opacity property is a part of the W3C CSS3 recommendation.

Try it Yourself - Examples

Creating transparent images - Hover effect

Creating a transparent box with text on a background image

Example 1 - Creating a Transparent Image

The CSS3 property for transparency is opacity.

First we will show you how to create a transparent image with CSS.

Regular image:

Thesame image with transparency:

Look at the following CSS:

img

{

opacity:0.4;

filter:alpha(opacity=40); /* For IE8 and earlier */

}

IE9, Firefox, Chrome, Opera, and Safari use the prope rty opacityfor transparency. The opacity property can take

a value from 0.0 - 1.0. A lower value makes the element more transparent.

IE8 and earlier use filter:alpha(opacity=x). The x can take a value from 0 - 100. A lower value makes the

element more transparent.

Example 2 - Image Transparency - Hover Effect

Mouse over the images:

The CSS looks like this:

img

{

opacity:0.4;

filter:alpha(opacity=40); /* For IE8 and earlier */}

img:hover

{

opacity:1.0;

filter:alpha(opacity=100); /* For IE8 and earlier */

}

The first CSS block is similar to the code in Example 1. In addition, we have added w hat should happen when a

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Previous Next Chapter

user hover over one of the images. In this case we want the image to NOT be transparent when the user hover

over it.

The CSS for this is: opacity=1.

IE8 and earlier: filter:alpha(opacity=100) .

When the mouse pointer moves away from the image, the image will be transparent aga in.

Example 3 - Text in Transparent Box

The source code looks like this:

div.background {

width:500px;

height:250px;

background:url(klematis.jpg) repeat;

border:2px solid black;

}

div.transbox

{

width:400px;

height:180px;

margin:30px 50px;

background-color:#ffffff;

border:1px solid black;

opacity:0.6;

filter:alpha(opacity=60); /* For IE8 and earlier */

}

div.transbox p

{

margin:30px 40px; font-weight:bold;

color:#000000;

}

This is some text that is placed in the transparent box.

This is some text that is placed in the transparent box.

This is some text that is placed in the transparent box.

This is some text that is placed in the transparent box.

This is some text that is placed in the transparent box.

First, we create a d iv element (class="background") with a fixed height a nd width, a background image, and a

border. Then we create a smaller div (class="transbox") inside the first div element. The "transbox" div have a

fixed w idth, a background color, and a border - and it is transpa rent. Inside the transparent div, we add some

text inside a p e lement.

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