CSS References
CSS - Reference CSS - Selectors CSS - Functions CSS - Units CSS - Animatable CSS - Entities
All CSS Properties
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 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 z-index

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;


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:

background-size 4
1 -webkit-
3.6 -moz-
10 -o-
3 -webkit-

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