max-height

The max-height CSS property sets the maximum height of an element. It prevents the used value of the height property from becoming larger than the value specified for max-height.

max-height overrides height, but min-height overrides max-height.

Syntax

/* <length> value */
max-height: 3.5em;

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

/* Keyword values */
max-height: none;
max-height: max-content;
max-height: min-content;
max-height: fit-content(20em);

/* Global values */
max-height: inherit;
max-height: initial;
max-height: revert;
max-height: revert-layer;
max-height: unset;

Values

<length>: Defines the max-height as an absolute value.
<percentage>: Defines the max-height as a percentage of the containing block's height.
none: No limit on the size of the box.
max-content: The intrinsic preferred max-height.
min-content: The intrinsic minimum max-height.
fit-content(<length-percentage>): Uses the fit-content formula with the available space replaced by the specified argument, i.e. min(max-content, max(min-content, argument)).

Accessibility concerns

Ensure that elements set with a max-height are not truncated and/or do not obscure other content when the page is zoomed to increase text size.

Formal definition

Initial value	none
Applies to	all elements that accept width or height
Inherited	no
Computed value	as specified, with <length-percentage> values computed
Animation type	by computed value, recursing into fit-content()

Formal syntax

none | <length-percentage [0,∞]> | min-content | max-content | fit-content(<length-percentage [0,∞]>)

Examples

Setting max-height using percentage and keyword values

table {
  max-height: 75%;
}

form {
  max-height: none;
}

css properties max-height