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.
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: revert; background-position-y: revert-layer; 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
| Initial value | 0% |
|---|---|
| Applies to | all elements |
| Inherited | no |
| Computed value | A list, each item consisting of: an offset given as a computed <length-percentage> value, plus an origin keyword |
| Animation type | repeatable list |
Formal syntax
[ center | [ [ top | bottom | y-start | y-end ]? <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://mdn.dev/archives/media/attachments/2020/07/29/17350/3b4892b7e820122ac6dd7678891d4507/firefox.png);
background-repeat: no-repeat;
background-position-x: center;
background-position-y: bottom 10px;
}