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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 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 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-kerning font-size font-size-adjust font-stretch font-style font-variant font-weight 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 @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 max-height max-width @media min-height min-width mix-blend-mode object-fit object-position opacity order outline outline-color outline-offset outline-style outline-width overflow 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 scroll-behavior tab-size table-layout text-align text-align-last text-decoration text-decoration-color text-decoration-line text-decoration-style 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 width word-break word-spacing word-wrap writing-mode z-index



CSS rgba() Function

❮ CSS Functions Reference

Example

Define different RGB colors with opacity (RGBA):

#p1 {background-color:rgba(255,0,0,0.3);} /* red with opacity*/
#p2 {background-color:rgba(0,255,0,0.3);} /* green with opacity */
#p3 {background-color:rgba(0,0,255,0.3);} /* blue with opacity */
Try it Yourself »

Definition and Usage

The rgba() function define colors using the Red-green-blue-alpha (RGBA) model.

RGBA color values are an extension of RGB color values with an alpha channel - which specifies the opacity of the color.

Version: CSS3

Browser Support

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

Function
rgba() 1.0 9.0 3.0 3.1 10.0

CSS Syntax

rgba(red, green, blue, alpha)
Value Description
red Defines the intensity of red as an integer between 0 and 255, or as a percentage value between 0% and 100%
green Defines the intensity of green as an integer between 0 and 255, or as a percentage value between 0% and 100%
blue Defines the intensity of blue as an integer between 0 and 255, or as a percentage value between 0% and 100%
alpha Defines the opacity as a number between 0.0 (fully transparent) and 1.0 (fully opaque)

❮ CSS Functions Reference