background-position-x
Baseline
Widely available
*
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.
* Some parts of this feature may have varying levels of support.
The background-position-x CSS property sets the initial horizontal position for each background image. The position is relative to the position layer set by background-origin.
Try it
background-position-x: left;
background-position-x: center;
background-position-x: 25%;
background-position-x: 2rem;
background-position-x: right 32px;
<section class="display-block" id="default-example">
<div class="transition-all" id="example-element"></div>
</section>
#example-element {
background-color: navajowhite;
background-image: url("/shared-assets/images/examples/star.png");
background-repeat: no-repeat;
height: 100%;
}
The value of this property is overridden by any declaration of the background or background-position shorthand properties applied to the element after it.
Syntax
/* Keyword values */
background-position-x: left;
background-position-x: center;
background-position-x: right;
/* <percentage> values */
background-position-x: 25%;
/* <length> values */
background-position-x: 0px;
background-position-x: 1cm;
background-position-x: 8em;
/* Side-relative values */
background-position-x: right 3px;
background-position-x: left 25%;
/* Multiple values */
background-position-x: 0px, center;
/* Global values */
background-position-x: inherit;
background-position-x: initial;
background-position-x: revert;
background-position-x: revert-layer;
background-position-x: unset;
The background-position-x property is specified as one or more values, separated by commas.
Values
left-
Aligns the left edge of the background image with the left edge of the background position layer.
center-
Aligns the center of the background image with the center of the background position layer.
right-
Aligns the right edge of the background image with the right edge of the background position layer.
<length>-
The offset of the given background image's left vertical edge from the background position layer's left vertical edge. (Some browsers allow assigning the right edge for offset).
<percentage>-
The offset of the given background image's horizontal position relative to the container. A value of 0% means that the left edge of the background image is aligned with the left edge of the container, and a value of 100% means that the right edge of the background image is aligned with the right edge of the container, thus a value of 50% horizontally centers the background image.
Formal definition
| Initial value | 0% |
|---|---|
| Applies to | all elements. It also applies to ::first-letter and ::first-line. |
| Inherited | no |
| Percentages | refer to width of background positioning area minus width of background image |
| Computed value | A list, each item consisting of: an offset given as a combination of an absolute length and a percentage, plus an origin keyword |
| Animation type | a repeatable list |
Formal syntax
background-position-x =
[ center | [ [ left | right | x-start | x-end ]? <length-percentage>? ]! ]#
<length-percentage> =
<length> |
<percentage>
Examples
Basic example
The following example shows a background image implementation, with background-position-x and background-position-y used to define the image's horizontal and vertical positions separately.
HTML
<div></div>
CSS
div {
width: 300px;
height: 300px;
background-color: skyblue;
background-image: url("https://mdn.dev/archives/media/attachments/2020/07/29/17350/3b4892b7e820122ac6dd7678891d4507/firefox.png");
background-repeat: no-repeat;
background-position-x: center;
background-position-y: bottom;
}
Result
Side-relative values
The following example shows support for side-relative offset syntax, which allows the developer to offset the background from any edge.
HTML
<div></div>
CSS
div {
width: 300px;
height: 300px;
background-color: seagreen;
background-image: url("https://mdn.dev/archives/media/attachments/2020/07/29/17350/3b4892b7e820122ac6dd7678891d4507/firefox.png");
background-repeat: no-repeat;
background-position-x: right 20px;
background-position-y: bottom 10px;
}
Result
Specifications
| Specification |
|---|
| CSS Backgrounds Module Level 4 # background-position-longhands |
Browser compatibility
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