CSS3 background-size Property

Example

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;
}

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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

CSS Syntax
background-size: auto|length|cover|contain|initial|inherit;
Property Values
Value Description Play it
auto Default value. The background image is displayed in its original size div {
background-image:url(‘w3css.gif’);
background-repeat:no-repeat;
background-size:auto;
}
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” div {
background-image:url(‘w3css.gif’);
background-repeat:no-repeat;
background-size:length ;
}
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” div {
background-image:url(‘w3css.gif’);
background-repeat:no-repeat;
background-size:percentage ;
}
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 div {
background-image:url(‘w3css.gif’);
background-repeat:no-repeat;
background-size:cover;
}
contain Resize the background image to make sure the image is fully visible div {
background-image:url(‘w3css.gif’);
background-repeat:no-repeat;
background-size:contain;
}
initial Sets this property to its default value. Read about initial div {
background-image:url(‘w3css.gif’);
background-repeat:no-repeat;
background-size:initial;
}
inherit Inherits this property from its parent element. Read about inherit

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%;
}

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Example

Specify the size of a background image with “cover”:

#example1 {
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: cover;
}

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Example

Specify the size of a background image with “contain”:

#example1 {
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: contain;
}

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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;
}

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