CSS3 Tutorial

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Browser Support

Internet Explorer 9+, Firefox, Chrome, Safari, and Opera support the new background properties.

CSS3 The background-size Property

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

Before CSS3, the background image size was determined by the actual size of the image. In CSS3 it is possible to specify the size of the background image, which allows us to re-use background images in different contexts.

You can specify the size in pixels or in percentages. If you specify the size as a percentage, the size is relative to the width and height of the parent element.

Example 1

Resize a background image:

div
{
background:url(img_flwr.gif);
background-size:80px 60px;
background-repeat:no-repeat;
}

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Example 2

Stretch the background image to completely fill the content area:

div
{
background:url(img_flwr.gif);
background-size:100% 100%;
background-repeat:no-repeat;
}

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CSS3 The background-origin Property

The background-origin property specifies the positioning area of the background images.

The background image can be placed within the content-box, padding-box, or border-box area. 

Example

Position the background image within the content-box:

div
{
background:url(img_flwr.gif);
background-repeat:no-repeat;
background-size:100% 100%;
background-origin:content-box;
}

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Example

Set two background images for the body element:

body
{
background-image:url(img_flwr.gif),url(img_tree.gif);
}

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New Background Properties