CSS Image Opacity / Transparency

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:
klematis

The same image with transparency:
klematis

Look at the following CSS:

img
{
opacity:0.4;
filter:alpha(opacity=40); /* For IE8 and earlier */
}

IE9, Firefox, Chrome, Opera, and Safari uses the property opacity for transparency. The opacity property can take a value from 0.0 - 1.0. A lower value makes the element more transparent.
IE8 and earlier uses 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:
klematis

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 what should happen when a 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: filters:alpha(opacity=100).
When the mouse pointer moves away from the image, the image will be transparent again.

Example 3 - Text in 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. This is some text that is placed in the transparent box.

The source code looks like this:
<html>
<head>
<style type="text/css">
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;
}
</style>
</head>

<body>

<div class="background">
<div class="transbox">
<p>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.
</p>
</div>
</div>

</body>
</html>

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