background-position-y - CSS: Cascading Style Sheets 编辑

The background-position-y CSS property sets the initial vertical 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-y: top;
background-position-y: center;
background-position-y: bottom;

/* <percentage> values */
background-position-y: 25%;

/* <length> values */
background-position-y: 0px;
background-position-y: 1cm;
background-position-y: 8em;

/* Side-relative values */
background-position-y: bottom 3px;
background-position-y: bottom 10%;

/* Multiple values */
background-position-y: 0px, center;

/* Global values */
background-position-y: inherit;
background-position-y: initial;
background-position-y: unset;

The background-position-y property is specified as one or more values, separated by commas.

Values

top

Aligns the top edge of the background image with the top edge of the background position layer.

center

Aligns the vertical center of the background image with the vertical center of the background position layer.

bottom

Aligns the bottom edge of the background image with the bottom edge of the background position layer.

<length>

The offset of the given background image's horizontal edge from the corresponding background position layer's top horizontal edge. (Some browsers allow assigning the bottom edge for offset).

<percentage>

The offset of the given background image's vertical position relative to the container. A value of 0% means that the top edge of the background image is aligned with the top edge of the container, and a value of 100% means that the bottom edge of the background image is aligned with the bottom edge of the container, thus a value of 50% vertically centers the background image.

Formal definition

Formal syntax

[ center | [ [ top | bottom | y-start | y-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://www.wenjiangs.com/wp-content/uploads/2020/mozilla/firefox.png);
  background-repeat: no-repeat;
  background-position-x: center;
  background-position-y: bottom 10px;
}

Result

Specifications

Browser compatibility

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The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

See also

• background-position
• background-position-x
• background-position-inline
• background-position-block
• Using multiple backgrounds