BEST SITE FOR WEB DEVELOPERS

CSS Tutorial

CSS HOME CSS Introduction CSS Syntax CSS Selectors CSS How To CSS Comments CSS Colors CSS Backgrounds CSS Borders CSS Margins CSS Padding CSS Height/Width CSS Box Model CSS Outline CSS Text CSS Fonts CSS Icons CSS Links CSS Lists CSS Tables CSS Display CSS Max-width CSS Position CSS Z-index CSS Overflow CSS Float CSS Inline-block CSS Align CSS Combinators CSS Pseudo-class CSS Pseudo-element CSS Opacity CSS Navigation Bar CSS Dropdowns CSS Image Gallery CSS Image Sprites CSS Attr Selectors CSS Forms CSS Counters CSS Website Layout CSS Units CSS Specificity CSS !important CSS Math Functions

CSS Advanced

CSS Rounded Corners CSS Border Images CSS Backgrounds CSS Colors CSS Color Keywords CSS Gradients CSS Shadows CSS Text Effects CSS Web Fonts CSS 2D Transforms CSS 3D Transforms CSS Transitions CSS Animations CSS Tooltips CSS Style Images CSS Image Reflection CSS object-fit CSS object-position CSS Masking CSS Buttons CSS Pagination CSS Multiple Columns CSS User Interface CSS Variables CSS Box Sizing CSS Media Queries CSS MQ Examples CSS Flexbox

CSS Responsive

RWD Intro RWD Viewport RWD Grid View RWD Media Queries RWD Images RWD Videos RWD Frameworks RWD Templates

CSS Grid

Grid Intro Grid Container Grid Item

CSS SASS

SASS Tutorial

CSS Examples

CSS Templates CSS Examples CSS Quiz CSS Exercises CSS Certificate

CSS References

CSS Reference CSS Selectors CSS Functions CSS Reference Aural CSS Web Safe Fonts CSS Animatable CSS Units CSS PX-EM Converter CSS Colors CSS Color Values CSS Default Values CSS Browser Support

CSS Lessons for beginners

Ua

CSS Opacity / Transparency


The opacity property specifies the opacity/transparency of an element.


Transparent Image

The opacity property can take a value from 0.0 - 1.0. The lower value, the more transparent:

opacity 0.2

opacity 0.2

opacity 0.5

opacity 0.5

opacity 1 (default)

opacity 1
(default)

Example

img {
  opacity: 0.5;
}
Try it Yourself »

Transparent Hover Effect

The opacity property is often used together with the :hover selector to change the opacity on mouse-over:

Northern Lights
Mountains
Italy

Example

img {
  opacity: 0.5;
}

img:hover {
  opacity: 1.0;
}
Try it Yourself »

Example explained

The first CSS block is similar to the code in Example 1. In addition, we have added what should happen when a user hovers over one of the images. In this case we want the image to NOT be transparent when the user hovers over it. The CSS for this is opacity:1;.

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

An example of reversed hover effect:

Northern Lights
Mountains
Italy

Example

img:hover {
  opacity: 0.5;
}
Try it Yourself »

Transparent Box

When using the opacity property to add transparency to the background of an element, all of its child elements inherit the same transparency. This can make the text inside a fully transparent element hard to read:

opacity 1

opacity 0.6

opacity 0.3

opacity 0.1

Example

div {
  opacity: 0.3;
}
Try it Yourself »

Transparency using RGBA

If you do not want to apply opacity to child elements, like in our example above, use RGBA color values. The following example sets the opacity for the background color and not the text:

100% opacity

60% opacity

30% opacity

10% opacity

You learned from our CSS Colors Chapter, that you can use RGB as a color value. In addition to RGB, you can use an RGB color value with an alpha channel (RGBA) - which specifies the opacity for a color.

An RGBA color value is specified with: rgba(red, green, blue, alpha). The alpha parameter is a number between 0.0 (fully transparent) and 1.0 (fully opaque).

Tip: You will learn more about RGBA Colors in our CSS Colors Chapter.

Example

div {
  background: rgba(76, 175, 80, 0.3) /* Green background with 30% opacity */
}
Try it Yourself »

Text in Transparent Box

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

Example

<html>
<head>
<style>
div.background {
  background: url(klematis.jpg) repeat;
  border: 2px solid black;
}

div.transbox {
  margin: 30px;
  background-color: #fff;
  border: 1px solid black;
  opacity: 0.6;
}

div.transbox p {
  margin: 5%;
  font-weight: bold;
  color: #000;
}
</style>
</head>
<body>

<div class="background">
  <div class="transbox">
    <p>This is some text that is placed in the transparent box.</p>
  </div>
</div>

</body>
</html>
Try it Yourself »

Example explained

First, we create a <div> element (class="background") with a background image, and a border.

Then we create another <div> (class="transbox") inside the first <div>.

The <div class="transbox"> have a background color, and a border - the div is transparent.

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


Test Yourself With Exercises

Exercise:

Use CSS to set the transparency of the image to 50%.

<style>
img {
  : ;
}
</style>

<body>
  <img src="klematis.jpg" width="150" height="113">
</body>