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CSS background-size Property

The background-size property specifies the size of the element's background image.

The background-size property is specified in one of the following ways:

  • Using the keyword values contain or cover
  • Using a width value only, in which case the height defaults to auto
  • Using both a width and a height value, in which case the first sets the width and the second sets the height

CSS Demo: background-size

background-size: auto;
background-size: contain;
background-size: cover;
background-size: 50%;
background-size: 260px;
background-size: 130px 200px;

Technical Details

Default value auto
Applies to all elements
Inherited no
Computed value as specified, but with relative lengths converted into absolute lengths
Animatable yes See animatable properties. Demo
Version CSS3
JavaScript syntax object.style.backgroundSize = "contain" Demo


CSS Syntax:

background-size: auto|length|cover|contain|initial|inherit;

Examples

The following example shows how to use background-size property:

Run code

The following example creates a full size background image:

Run code

Browser compatibility

The numbers in the table specify the first browser version that fully supports the background-size property:

Property
background-size 4
1 -webkit-
4
3.6 -moz-
10.5
10 -o-
4
3 -webkit-
9

Property Values

The following table describes the values of background-size property:

Value Description
auto The background image is displayed in its original size (This is default)
length Sets the width and height of the background image to the specified length. The first value sets the width, and the second value set the height. If only one value is specified the second is assumed to be auto. Negative values are not allowed. See length units
contain Scales the image as large as possible without cropping or stretching the image
cover Scales the image as large as possible without stretching the image. If the proportions of the image differ from the element, it is cropped either vertically or horizontally so that no empty space remains
initial Sets this property to its default value
inherit Inherits this property from its parent element

See also

CSS Background tutorial

CSS background property

CSS background-image property

CSS background-attachment property

CSS background-position property