freeCodeCamp/guide/english/css/image-opacity-and-transparency/index.md

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Image Opacity and Transparency

Image Opacity and Transparency

The opacity property allows you to make an image transparent by lowering how opaque it is.

Opacity takes a value between 0.0 and 1.0.

1.0 is the default value for any image. It is fully opaque. (default)

Note: When using the opacity property to add transparency to the background of an element, all of its child elements become transparent as well. This can make the text inside a fully transparent element hard to read. If you do not want to apply opacity to child elements, use RGBA color values instead.

Example:

img {
  opacity: 0.3;
}

Include filter: alpha(opacity=x) for IE8 and earlier. The x takes a value from 0-100.

img {
  opacity: 0.3;
  filter: alpha(opacity=30);
}

Here's an example of an image set to the parameters in the example above:

You can pair opacity with :hover to create a dynamic mouse-over effect.

Example:

img {
  opacity: 0.3;
  filter: alpha(opacity=30);
}
img:hover {
  opacity: 1.0;
  filter: alpha(opacity=100);
}

Here's a codepen example to show a transparent image turning opaque on hover

You can create the opposite effect with less code since the image is 1.0 opacity by default.

Example:

img:hover {
  opacity: 0.3;
  filter: alpha(opacity=30);
}

Here's a codepen example to show transparency on mouse-over

More Information:

• w3schools.com: CSS Opacity/Transparency
• MDN Web Docs: Opacity