Tutorials References Exercises Videos Menu
Free Website Get Certified Pro

CSS Reference

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

CSS Properties

accent-color align-content align-items align-self all animation animation-delay animation-direction animation-duration animation-fill-mode animation-iteration-count animation-name animation-play-state animation-timing-function backdrop-filter backface-visibility background background-attachment background-blend-mode background-clip background-color background-image background-origin background-position background-repeat background-size border border-bottom border-bottom-color border-bottom-left-radius border-bottom-right-radius border-bottom-style border-bottom-width border-collapse border-color border-image border-image-outset border-image-repeat border-image-slice border-image-source border-image-width border-left border-left-color border-left-style border-left-width border-radius border-right border-right-color border-right-style border-right-width border-spacing border-style border-top border-top-color border-top-left-radius border-top-right-radius border-top-style border-top-width border-width bottom box-decoration-break box-shadow box-sizing break-after break-before break-inside caption-side caret-color @charset clear clip clip-path color column-count column-fill column-gap column-rule column-rule-color column-rule-style column-rule-width column-span column-width columns content counter-increment counter-reset cursor direction display empty-cells filter flex flex-basis flex-direction flex-flow flex-grow flex-shrink flex-wrap float font @font-face font-family font-feature-settings font-kerning font-size font-size-adjust font-stretch font-style font-variant font-variant-caps font-weight gap grid grid-area grid-auto-columns grid-auto-flow grid-auto-rows grid-column grid-column-end grid-column-gap grid-column-start grid-gap grid-row grid-row-end grid-row-gap grid-row-start grid-template grid-template-areas grid-template-columns grid-template-rows hanging-punctuation height hyphens image-rendering @import isolation justify-content @keyframes left letter-spacing line-height list-style list-style-image list-style-position list-style-type margin margin-bottom margin-left margin-right margin-top mask-image mask-mode mask-origin mask-position mask-repeat mask-size max-height max-width @media min-height min-width mix-blend-mode object-fit object-position opacity order orphans outline outline-color outline-offset outline-style outline-width overflow overflow-wrap overflow-x overflow-y padding padding-bottom padding-left padding-right padding-top page-break-after page-break-before page-break-inside perspective perspective-origin pointer-events position quotes resize right row-gap scroll-behavior tab-size table-layout text-align text-align-last text-decoration text-decoration-color text-decoration-line text-decoration-style text-decoration-thickness text-indent text-justify text-overflow text-shadow text-transform top transform transform-origin transform-style transition transition-delay transition-duration transition-property transition-timing-function unicode-bidi user-select vertical-align visibility white-space widows width word-break word-spacing word-wrap writing-mode z-index



CSS opacity Property


Example

Set the opacity level for a <div> element:

div {
  opacity: 0.5;
}
Try it Yourself »

More "Try it Yourself" examples below.


Definition and Usage

The opacity property sets the opacity level for an element.

The opacity-level describes the transparency-level, where 1 is not transparent at all, 0.5 is 50% see-through, and 0 is completely transparent.

opacity 0.2

opacity 0.5

opacity 1
(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 (See "More Examples" below).

Show demo ❯

Default value: 1
Inherited: no
Animatable: yes, see individual properties. Read about animatable Try it
Version: CSS3
JavaScript syntax: object.style.opacity="0.5" Try it

Browser Support

The numbers in the table specify the first browser version that fully supports the property.

Property
opacity 4.0 9.0 2.0 3.1 9.0

Note: IE8 and earlier versions supports an alternative, the filter property. Like: filter:Alpha(opacity=50).



CSS Syntax

opacity: number|initial|inherit;

Property Values

Value Description Demo
number Specifies the opacity. From 0.0 (fully transparent) to 1.0 (fully opaque) Demo ❯
initial Sets this property to its default value. Read about initial
inherit Inherits this property from its parent element. Read about inherit

More Examples

Example

The opacity property adds transparency to the background of an element, and to all of its child elements as well. This makes the text inside a transparent element hard to read:

div.first {
  opacity: 0.1;
}

div.second {
  opacity: 0.3;
}

div.third {
  opacity: 0.6;
}
Try it Yourself »

Example

To not apply opacity to child elements (like in the example above) use RGBA color values instead. The following example sets the opacity for the background color, but not for the text:

div.first {
  background: rgba(76, 175, 80, 0.1);
}

div.second {
  background: rgba(76, 175, 80, 0.3);
}

div.third {
  background: rgba(76, 175, 80, 0.6);
}
Try it Yourself »

Tip: Learn more about RGBA Colors in CSS RGBA Colors.

Example

How to use JavaScript to change the opacity for an element:

function myFunction(x) {
// Return the text of the selected option
  var opacity = x.options[x.selectedIndex].text;
  var el = document.getElementById("p1");
  if (el.style.opacity !== undefined) {
    el.style.opacity = opacity;
  } else {
    alert("Your browser doesn't support this example!");
  }
}
Try it Yourself »

Related Pages

CSS Tutorial: CSS Opacity / Transparency

CSS Tutorial: CSS RGBA Colors

HTML DOM Reference: opacity property