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
.
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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: 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 | left |
---|---|
Applies to | all elements |
Inherited | no |
Percentages | refer to width of background positioning area minus height 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 | discrete |
Formal syntax
[ center | [ [ left | right | x-start | x-end ]? <length-percentage>? ]! ]#where <length-percentage> = <length> | <percentage>
Examples
Basic example
The following example shows a simple 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://media.prod.mdn.mozit.cloud/attachments/2020/07/29/17350/3b4892b7e820122ac6dd7678891d4507/firefox.png);
background-repeat: no-repeat;
background-position-x: center;
background-position-y: bottom 10px;
}
Result
Specifications
Specification | Status | Comment |
---|---|---|
CSS Backgrounds and Borders Module Level 4 The definition of 'background-position-x' in that specification. |
Editor's Draft | Initial specification of longhand sub-properties of background-position to match longstanding implementations. |
Browser compatibility
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