Hướng dẫn background-image trong html w3schools

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Background Cover

If you want the background image to cover the entire element, you can set the background-size property to cover.

Also, to make sure the entire element is always covered, set the background-attachment property to fixed:

This way, the background image will cover the entire element, with no stretching (the image will keep its original proportions):

Example

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Background Stretch

If you want the background image to stretch to fit the entire element, you can set the background-size property to 100% 100%:

Try resizing the browser window, and you will see that the image will stretch, but always cover the entire element.

Example

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Learn More CSS

From the examples above you have learned that background images can be styled by using the CSS background properties.

To learn more about CSS background properties, study our CSS Background Tutorial.

Example

Set a background-image for the element:

body {
 background-image: url("paper.gif");
 background-color: #cccccc;
}

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Example

Set two background images for the element:

body {
  background-image: url("img_tree.gif"), url("paper.gif");
  background-color: #cccccc;
}

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More "Try it Yourself" examples below.

Definition and Usage

The background-image property sets one or more background images for an element.

By default, a background-image is placed at the top-left corner of an element, and repeated both vertically and horizontally.

Tip: The background of an element is the total size of the element, including padding and border (but not the margin).

Tip: Always set a background-color to be used if the image is unavailable.

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Browser Support

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

Note: IE8 and earlier do not support multiple background images.

CSS Syntax

background-image: url|none|initial|inherit;

Property Values

More Examples

Example

Sets two background images for the element. Let the first image appear only once (with no-repeat), and let the second image be repeated:

body {
  background-image: url("img_tree.gif"), url("paper.gif");
  background-repeat: no-repeat, repeat;
  background-color: #cccccc;
}

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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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Example

Sets a linear-gradient (two colors) as a background image for a