Background color height and width in css

CSS background-size Property

Specify the size of a background-image with «auto» and in pixels:

#example1 <
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: auto;
>

#example2 background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: 300px 100px;
>

More «Try it Yourself» examples below.

Definition and Usage

The background-size property specifies the size of the background images.

There are four different syntaxes you can use with this property: the keyword syntax («auto», «cover» and «contain»), the one-value syntax (sets the width of the image (height becomes «auto»), the two-value syntax (first value: width of the image, second value: height), and the multiple background syntax (separated with comma).

Default value:	auto
Inherited:	no
Animatable:	yes. Read about animatable Try it
Version:	CSS3
JavaScript syntax:	object.style.backgroundSize=»60px 120px» Try it

Browser Support

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

Numbers followed by -webkit-, -moz-, or -o- specify the first version that worked with a prefix.

CSS Syntax

Property Values

Value	Description	Demo
auto	Default value. The background image is displayed in its original size	Demo ❯
length	Sets the width and height of the background image. The first value sets the width, the second value sets the height. If only one value is given, the second is set to «auto». Read about length units	Demo ❯
percentage	Sets the width and height of the background image in percent of the parent element. The first value sets the width, the second value sets the height. If only one value is given, the second is set to «auto»	Demo ❯
cover	Resize the background image to cover the entire container, even if it has to stretch the image or cut a little bit off one of the edges	Demo ❯
contain	Resize the background image to make sure the image is fully visible	Demo ❯
initial	Sets this property to its default value. Read about initial
inherit	Inherits this property from its parent element. Read about inherit

More Examples

Example

Specify the size of a background image with percent:

#example1 <
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: 100% 100%;
>

#example2 background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: 75% 50%;
>

Example

Specify the size of a background image with «cover»:

Example

Specify the size of a background image with «contain»:

Example

Here we have two background images. We specify the size of the first background image with «contain», and the second background-image with «cover»:

#example1 <
background: url(img_tree.gif), url(mountain.jpg);
background-repeat: no-repeat;
background-size: contain, cover;
>

Example

Use different background properties to create a «hero» image:

.hero-image <
background-image: url(«photographer.jpg»); /* The image used */
background-color: #cccccc; /* Used if the image is unavailable */
height: 500px; /* You must set a specified height */
background-position: center; /* Center the image */
background-repeat: no-repeat; /* Do not repeat the image */
background-size: cover; /* Resize the background image to cover the entire container */
>

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background

The background shorthand CSS property sets all background style properties at once, such as color, image, origin and size, or repeat method. Component properties not set in the background shorthand property value declaration are set to their default values.

Try it

Constituent properties

This property is a shorthand for the following CSS properties:

Syntax

/* Using a */ background: green; /* Using a and */ background: url("test.jpg") repeat-y; /* Using a and */ background: border-box red; /* A single image, centered and scaled */ background: no-repeat center/80% url("../img/image.png"); /* Global values */ background: inherit; background: initial; background: revert; background: revert-layer; background: unset; 

The background property is specified as one or more background layers, separated by commas.

The syntax of each layer is as follows:

• Each layer may include zero or one occurrences of any of the following values:
  • The value may only be included immediately after , separated with the ‘/’ character, like this: » center/80% «.
  • The value may be included zero, one, or two times. If included once, it sets both background-origin and background-clip . If it is included twice, the first occurrence sets background-origin , and the second sets background-clip .
  • The value may only be included in the last layer specified.

  Values

  See background-clip and background-origin . Default: border-box and padding-box respectively.

  See background-color . Default: transparent .

  The following three lines of CSS are equivalent:

  background: none; background: transparent; background: repeat scroll 0% 0% / auto padding-box border-box none transparent; 

  Accessibility concerns

  Browsers do not provide any special information on background images to assistive technology. This is important primarily for screen readers, as a screen reader will not announce its presence and therefore convey nothing to its users. If the image contains information critical to understanding the page’s overall purpose, it is better to describe it semantically in the document.

  Formal definition

  • background-image : none
  • background-position : 0% 0%
  • background-size : auto auto
  • background-repeat : repeat
  • background-origin : padding-box
  • background-clip : border-box
  • background-attachment : scroll
  • background-color : transparent
  • background-position : refer to the size of the background positioning area minus size of background image; size refers to the width for horizontal offsets and to the height for vertical offsets
  • background-size : relative to the background positioning area
  • background-image : as specified, but with url() values made absolute
  • background-position : as each of the properties of the shorthand:
    • background-position-x : A list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword
    • background-position-y : A list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword
    • background-color : a color
    • background-image : discrete
    • background-clip : a repeatable list of
    • background-position : a repeatable list of
    • background-size : a repeatable list of
    • background-repeat : discrete
    • background-attachment : discrete

    Formal syntax

    background =
    [ # , ]?

    =
    ||
    [ / ]? ||
    ||
    ||
    ||
    

    =
    ||
    ||
    [ / ]? ||
    ||
    ||
    ||
    

    =
    |
    none

    =
    [ left | center | right | top | bottom | ] |
    [ left | center | right | ] [ top | center | bottom | ] |
    [ center | [ left | right ] ? ] && [ center | [ top | bottom ] ? ]

    =
    [ | auto ] |
    cover |
    contain

    =
    repeat-x |
    repeat-y |
    [ repeat | space | round | no-repeat ]

    =
    scroll |
    fixed |
    local

    =
    border-box |
    padding-box |
    content-box

    =
    |

    =
    |

    =
    url( * ) |
    src( * )

    Examples

    Setting backgrounds with color keywords and images

    HTML

    p class="topbanner"> Starry skybr /> Twinkle twinklebr /> Starry sky p> p class="warning">Here is a paragraphp> p>p> 

    CSS

    .warning  background: pink; > .topbanner  background: url("starsolid.gif") #99f repeat-y fixed; > 

    Result

    Specifications

    Browser compatibility

    BCD tables only load in the browser

    See also

    Found a content problem with this page?

    This page was last modified on Jul 18, 2023 by MDN contributors.

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