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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 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 var() Function

❮ CSS Functions Reference

Example

First define a custom property named "--main-bg-color", then use the var() function to insert the value of the custom property later in the style sheet:

:root {
    --main-bg-color: coral;
}

#div1 {
    background-color: var(--main-bg-color);
}

#div2 {
    background-color: var(--main-bg-color);
}
Try it Yourself »

More "Try it Yourself" examples below.


Definition and Usage

The var() function is used to insert the value of a custom property instead of any part of a value of another property.

Version: CSS3

Browser Support

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

Function
var() 49.0 15.0 31.0 9.1 36.0

CSS Syntax

var(custom-property-name, value)
Value Description
custom-property-name Required. The custom property's name (must start with two dashes)
value Optional. The fallback value (used if the custom property is invalid)

More Examples

Example

Use the var() function to insert several custom property values:

:root {
    --main-bg-color: coral;
    --main-txt-color: blue;
    --main-padding: 15px;
}

#div1 {
    background-color: var(--main-bg-color);
    color: var(--main-txt-color);
    padding: var(--main-padding);
}

#div2 {
    background-color: var(--main-bg-color);
    color: var(--main-txt-color);
    padding: var(--main-padding);
}
Try it Yourself »

Related Pages

CSS tutorial: CSS Variables


❮ CSS Functions Reference