background

Übersicht

Die background CSS Eigenschaft ist eine Kurzschreibweise, um die verschiedenen Hintergrundwerte an einer einzigen Stelle im Stylesheet zu setzen. background kann dazu verwendet werden, einen oder mehrere der folgenden Werte zu setzen: background-clip, background-color, background-image, background-origin, background-position, background-repeat, background-size und background-attachment.

Die background CSS Kurzschreibweiseeigenschaft weist explizit angegebene Werte zu und setzt die fehlenden Eigenschaften auf deren Initialwerte zurück.

Syntax

/* Verwendung von <background-color> */
background: green;

/* Verwendung von <bg-image> und <repeat-style> */
background: url("test.jpg") repeat-y;

/* Verwendung von <box> und <background-color> */
background: border-box red;

/* Ein einzelnes Bild, zentriert und skaliert */
background: no-repeat center/80% url("../img/image.png");

Werte

Einer oder mehrere der folgenden Werte, in beliebiger Reihenfolge:

<attachment>

See background-attachment

<box>

See background-clip

<background-color>

See background-color

<bg-image>

See background-image

<position>

See background-position

<repeat-style>

See background-repeat

<bg-size>

See background-size. Diese Eigenschaft muss nach <position> angegeben werden, getrennt durch das '/'-Zeichen.

Formale Syntax

[ <bg-layer> , ]* <final-bg-layer>
wobei 
<bg-layer> = <bg-image> || <bg-position> [ / <bg-size> ]? || <repeat-style> || <attachment> || <box> || <box>
<final-bg-layer> = <'background-color'> || <bg-image> || <bg-position> [ / <bg-size> ]? || <repeat-style> || <attachment> || <box> || <box>
wobei 
<bg-image> = none | <image>
<bg-position> = [ [ left | center | right | top | bottom | <length-percentage> ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ] | [ center | [ left | right ] <length-percentage>? ] && [ center | [ top | bottom ] <length-percentage>? ] ]
<bg-size> = [ <length-percentage> | auto ]{1,2} | cover | contain
<repeat-style> = repeat-x | repeat-y | [ repeat | space | round | no-repeat ]{1,2}
<attachment> = scroll | fixed | local
<box> = border-box | padding-box | content-box
wobei 
<image> = <url> | <image()> | <image-set()> | <element()> | <cross-fade()> | <gradient>
<length-percentage> = <length> | <percentage>
wobei 
<image()> = image( [ [ <image> | <string> ]? , <color>? ]! )
<image-set()> = image-set( <image-set-option># )
<element()> = element( <id-selector> )
<cross-fade()> = cross-fade( <cf-mixing-image> , <cf-final-image>? )
<gradient> = <linear-gradient()> | <repeating-linear-gradient()> | <radial-gradient()> | <repeating-radial-gradient()>
wobei 
<color> = <rgb()> | <rgba()> | <hsl()> | <hsla()> | <hex-color> | <named-color> | currentcolor | <deprecated-system-color>
<image-set-option> = [ <image> | <string> ] <resolution>
<id-selector> = <hash-token>
<cf-mixing-image> = <percentage>? && <image>
<cf-final-image> = <image> | <color>
<linear-gradient()> = linear-gradient( [ <angle> | to <side-or-corner> ]? , <color-stop-list> )
<repeating-linear-gradient()> = repeating-linear-gradient( [ <angle> | to <side-or-corner> ]? , <color-stop-list> )
<radial-gradient()> = radial-gradient( [ <ending-shape> || <size> ]? [ at <position> ]? , <color-stop-list> )
<repeating-radial-gradient()> = repeating-radial-gradient( [ <ending-shape> || <size> ]? [ at <position> ]? , <color-stop-list> )
wobei 
<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>? )
<side-or-corner> = [ left | right ] || [ top | bottom ]
<color-stop-list> = <color-stop>#{2,}
<ending-shape> = circle | ellipse
<size> = closest-side | farthest-side | closest-corner | farthest-corner | <length> | <length-percentage>{2}
<position> = [ [ left | center | right ] || [ top | center | bottom ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ]? | [ [ left | right ] <length-percentage> ] && [ [ top | bottom ] <length-percentage> ] ]
wobei 
<alpha-value> = <number> | <percentage>
<hue> = <number> | <angle>
<color-stop> = <color> <length-percentage>?

Beispiele

HTML

<p class="topbanner">
  Starry sky<br/>
  Twinkle twinkle<br/>
  Starry sky
</p>
<p class="warning">Here is a paragraph<p>

CSS

.warning { 
  background: red; 
}

.topbanner { 
  background: url("https://mdn.mozillademos.org/files/11983/starsolid.gif") #00D repeat-y fixed; 
}

Result

Spezifikationen

Browser Kompatibilität

Siehe auch

• -moz-background-inline-policy
• Verwendung von CSS Farbverläufen
• Mehrere Hintergründe in CSS verwenden