The background-color
CSS property sets the background color of an element.
/* Keyword values */ background-color: red; background-color: indigo; /* Hexadecimal value */ background-color: #bbff00; /* Fully opaque */ background-color: #11ffee00; /* Fully transparent */ background-color: #11ffeeff; /* Fully opaque */ /* RGB value */ background-color: rgb(255, 255, 128); /* Fully opaque */ background-color: rgba(117, 190, 218, 0.5); /* 50% transparent */ /* HSL value */ background-color: hsl(50, 33%, 25%); /* Fully opaque */ background-color: hsla(50, 33%, 25%, 0.75); /* 75% transparent */ /* Special keyword values */ background-color: currentcolor; background-color: transparent; /* Global values */ background-color: inherit; background-color: initial; background-color: unset;
The background-color
property is specified as a single <color>
value.
<color>
background-image
that is specified, although the color will still be visible through any transparency in the image.<color>where
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>where
<rgb()> = rgb( <percentage>{3} [ / <alpha-value> ]? ) | rgb( <number>{3} [ / <alpha-value> ]? ) | rgb( <percentage>#{3} , <alpha-value>? ) | rgb( <number>#{3} , <alpha-value>? )
<rgba()> = rgba( <percentage>{3} [ / <alpha-value> ]? ) | rgba( <number>{3} [ / <alpha-value> ]? ) | rgba( <percentage>#{3} , <alpha-value>? ) | rgba( <number>#{3} , <alpha-value>? )
<hsl()> = hsl( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsl( <hue>, <percentage>, <percentage>, <alpha-value>? )
<hsla()> = hsla( <hue> <percentage> <percentage> [ / <alpha-value> ]? ) | hsla( <hue>, <percentage>, <percentage>, <alpha-value>? )where
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>
<div class="exampleone"> Lorem ipsum dolor sit amet, consectetuer </div> <div class="exampletwo"> Lorem ipsum dolor sit amet, consectetuer </div> <div class="examplethree"> Lorem ipsum dolor sit amet, consectetuer </div>
.exampleone { background-color: teal; color: white; } .exampletwo { background-color: rgb(153,102,153); color: rgb(255,255,204); } .examplethree { background-color: #777799; color: #FFFFFF; }
It is important to ensure that the contrast ratio between the background color and the color of the text placed over it is high enough that people experiencing low vision conditions will be able to read the content of the page.
Color contrast ratio is determined by comparing the luminosity of the text and background color values. In order to meet current Web Content Accessibility Guidelines (WCAG), a ratio of 4.5:1 is required for text content and 3:1 for larger text such as headings. Large text is defined as 18.66px and bold or larger, or 24px or larger.
Specification | Status | Comment |
---|---|---|
CSS Backgrounds and Borders Module Level 3 The definition of 'background-color' in that specification. | Candidate Recommendation | Though technically removing the transparent keyword, this doesn't change anything as it has been incorporated as a true <color>
|
CSS Level 2 (Revision 1) The definition of 'background-color' in that specification. | Recommendation | No change |
CSS Level 1 The definition of 'background-color' in that specification. | Recommendation | Initial definition |
Initial value | transparent |
---|---|
Applies to | all elements. It also applies to ::first-letter and ::first-line . |
Inherited | no |
Media | visual |
Computed value | computed color |
Animation type | a color |
Canonical order | the unique non-ambiguous order defined by the formal grammar |
Desktop | ||||||
---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
Basic support | 1 | 12 | 1 | 4
|
3.5 | 1 |
Alpha channel for hex values | 52 | No | No | No | No | No |
Mobile | |||||||
---|---|---|---|---|---|---|---|
Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
Basic support | Yes | Yes | Yes | 4 | Yes | Yes | Yes |
Alpha channel for hex values | 52 | 52 | No | No | No | No | 6.0 |
<color>
data typecolor
, border-color
, outline-color
, text-decoration-color
, text-emphasis-color
, text-shadow
, caret-color
, and column-rule-color
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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/background-color