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bottom

Summary

Sets the position of the bottom edge of an element.

Overview table

Initial value
auto
Applies to
All elements
Inherited
No
Media
visual
Computed value
If specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, 'auto’.
Animatable
Yes
CSS Object Model Property
bottom

Syntax

  • bottom: auto
  • bottom: length
  • bottom: percentage

Values

auto
Default. Default position, according to the regular HTML layout of the page.
length
Floating-point number, followed by an absolute units designator (cm, mm, in, pt, or pc) or a relative units designator (em, ex, or px). For more information about the supported length units, see CSS Values and Units Reference.
percentage
Integer, followed by a percent sign (%). The value is a percentage of the height of the parent object.

Examples

We demonstrate the `bottom` property by positioning these elements.

.container { /** * Object is positioned according to the normal flow, and then offset. */ position: relative; } .absolutely-positioned-within-container { /** * Object is positioned relative to nearest positioned ancestor—or * to the initial containing block if no positioned ancestor exists. * Here, the nearest positioned ancestor is the `<div class="container"^gt;`. */ position: absolute; /** * Offsets this element 50px above the container's bottom edge. * Note: `length` can also be specified in other units of measurements. */ bottom: 50px; } .absolutely-positioned-within-body { /** * Here, the nearest positioned anscestor does not exist, hence * the coordinate system reference becomes the initial containing block, * i.e. the `<body>`. */ position: absolute; /** * Offsets this element 100px above the initial containing * block's bottom edge i.e. the `<body>`'s bottom edge. */ bottom: 100px; } .relatively-positioned { /** * Object is positioned according to the normal flow, and then offset. */ position: relative; /** * The layout for this element happens according to the normal flow. * But because this element is positioned relatively, it will be * offset 20px towards the left from where it would have been in * the normal flow. */ bottom: 20px; }

View live example

The HTML for the above example.

 <article> <div class="container"> <p class="box absolutely-positioned-within-container">Absolutely positioned within <code>div.container</code> at 50px above the bottom edge.</p> <p class="box relatively-positioned">This is relatively positioned at 20px from the bottom.</p> </div> <p class="box absolutely-positioned-within-body">This is absolutely positioned within the <code>body</code> at 50px above the bottom edge.</p> </article>

Related specifications

CSS 2.1, Visual formatting model
W3C Recommendation

See also

Related articles

Box Model

Related pages

Attributions