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C # tutorial
Specify the size of a background-image with "auto" and in pixels
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 |
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.
| Property | |||||
|---|---|---|---|---|---|
| background-size | 4.0 1.0 -webkit- |
9.0 | 4.0 3.6 -moz- |
4.1 3.0 -webkit- |
10.5 10.0 -o- |
| 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 |
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%;
}
Specify the size of a background image with "cover":
#example1 {
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size: cover;
}
Specify the size of a background image with "contain":
#example1 {
background: url(mountain.jpg);
background-repeat: no-repeat;
background-size:
contain;
}
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;
}
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 */
}
CSS tutorial: CSS Backgrounds
HTML DOM reference: backgroundSize property