height

The height CSS property specifies the height of the content area of an element. The content area is inside the padding, border, and margin of the element.

The min-height and max-height properties override height.

Initial value	auto
Applies to	all elements but non-replaced inline elements, table columns, and column groups
Inherited	no
Percentages	The percentage is calculated with respect to the height of the generated box's containing block. If the height of the containing block is not specified explicitly (i.e., it depends on content height), and this element is not absolutely positioned, the value computes to auto. A percentage height on the root element is relative to the initial containing block.
Media	visual
Computed value	a percentage or auto or the absolute length
Animation type	a length, percentage or calc();
Canonical order	the unique non-ambiguous order defined by the formal grammar

Syntax

/* Keyword value */
height: auto;

/* <length> values */
height: 120px;
height: 10em;

/* <percentage> value */
height: 75%;

/* Global values */
height: inherit;
height: initial;
height: unset;

Values

<length>

See <length> for possible units.

<percentage>

Specified as a <percentage> of containing block's height.

border-box 

If present, the preceding <length> or <percentage> is applied to the element's border box.

content-box

If present, the preceding <length> or <percentage> is applied to the element's content box.

auto

The browser will calculate and select a height for the specified element.

fill

Use the fill-available inline size or fill-available block size, as appropriate to the writing mode.

max-content

The intrinsic preferred height.

min-content

The intrinsic minimum height.

available

The containing block height minus vertical margin, border and padding.

fit-content

The larger of:

• the intrinsic minimum height
• the smaller of the intrinsic preferred height and the available height

Formal syntax

[ <length> | <percentage> ] && [ border-box | content-box ]? | available | min-content | max-content | fit-content | auto

Example

HTML

<div id="red">
  <span>I'm 50 pixels tall.</span>
</div>
<div id="green">
  <span>I'm 25 pixels tall.</span>
</div>
<div id="parent">
  <div id="child">
    <span>I'm half the height of my parent.</span>
  </div>
</div>

CSS

div {
  width: 250px;
  margin-bottom: 5px;
  border: 3px solid #999999;
}

#red {
  height: 50px;
}

#green {
  height: 25px;
}

#parent {
  height: 100px;
}

#child {
  height: 50%;
  width: 75%;
}

Specifications

Specification	Status	Comment
CSS Basic Box Model The definition of 'height' in that specification.	Working Draft	Added the max-content, min-content, available, fit-content, border-box, content-box keywords.
CSS Transitions The definition of 'height' in that specification.	Working Draft	Lists height as animatable.
CSS Level 2 (Revision 1) The definition of 'height' in that specification.	Recommendation	Adds support for the <length> values and precises on which element it applies to.
CSS Level 1 The definition of 'height' in that specification.	Recommendation	Initial definition
CSS Intrinsic & Extrinsic Sizing Module Level 3 The definition of 'width' in that specification.	Working Draft	Adds new sizing keywords for width and height.

Browser compatibility

See also

• box model, width, box-sizing, min-height, max-height