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Showing content from https://developer.mozilla.org/en-US/docs/Web/CSS/background-position-x below:

background-position-x - CSS: Cascading Style Sheets

Baseline Widely available *

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.

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.

/* 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.

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.

background-position-x = 
  [ center | [ [ left | right | x-start | x-end ]? <length-percentage>? ]! ]#  
<length-percentage> = 

  <length>      |
  <percentage>  

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.

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;
}

The following example shows support for side-relative offset syntax, which allows the developer to offset the background from any edge.

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;
}

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