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CSS Image Opacity / Transparency

Creating transparent images with CSS is easy.

Examples

Creating transparent images - mouseover effect

Creating a transparent box with text on a background image

Example 1 - Creating a Transparent Image

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

Regular image:

The same image with transparency:

Look at the following source code:

<img src="klematis.jpg" width="150" height="113" alt="klematis"
style="-moz-opacity:0.4;filter:alpha(opacity=40) />

Mozilla uses the property -moz-opacity:x for transparency, while IE uses filter:alpha(opacity=x).

Tip: The CSS3 syntax for transparency is opacity:x. However, this syntax is not supported by any browsers yet.

In IE (filter:alpha(opacity=x)) x can be a value from 0 - 100. A lower value makes the element more transparent.

In Mozilla (-moz-opacity:x) x can be a value from 0.0 - 1.0. A lower value makes the element more transparent (The same things goes for the CSS3-valid syntax opacity:x).

Example 2 - Image Transparency - Mouseover Effect

Mouse over the images:

The source code looks like this:

<img src="klematis.jpg" width="150" height="113" alt="klematis"
style="-moz-opacity:0.4;filter:alpha(opacity=40)"
onmouseover="this.style.MozOpacity=1;this.filters.alpha.opacity=100"
onmouseout="this.style.MozOpacity=0.4;this.filters.alpha.opacity=40" />

<img src="klematis2.jpg" width="150" height="113" alt="klematis"
style="-moz-opacity:0.4;filter:alpha(opacity=40)"
onmouseover="this.style.MozOpacity=1;this.filters.alpha.opacity=100"
onmouseout="this.style.MozOpacity=0.4;this.filters.alpha.opacity=40" />

We see that the first two lines of the source code is similar to the source code in Example 1. In addition, we have added an onmouseover attribute and an onmouseout attribute. The onmouseover attribute defines what will happen when the mouse pointer moves over the image. In this case we want the image to NOT be transparent when we move the mouse pointer over it.

The syntax for this in Mozilla is: this.style.MozOpacity=1 and the syntax in IE is: this.filters.alpha.opacity=100.

When the mouse pointer moves away from the image, we want the image to be transparent again. This is done in the onmouseout attribute.

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;
  /* for IE */
  filter:alpha(opacity=60);
  /* CSS3 standard */
  opacity:0.6;
  /* for Mozilla */
  -moz-opacity:0.6;
  }
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>

First, we create a div element (class="background") with a fixed height and width, a background image, and a border. Then we create a smaller div (class="transbox") inside the first div element. This div also have a fixed width, a background image, and a border. In addition we make this div transparent. Notice that we have added three different syntaxes for the transparency.

Inside the transparent div, we add some text inside a p element.

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