The min-height CSS property sets the minimum height of an element. It prevents the used value of the height property from becoming smaller than the value specified for min-height.

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

/* <percentage> value */
min-height: 10%;

/* Keyword values */
min-height: max-content;
min-height: min-content;
min-height: fit-content;
min-height: fill-available;

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

The element's height is set to the value of min-height whenever min-height is larger than max-height or height.

Initial value0
Applies toall elements but non-replaced inline elements, table columns, and column groups
Inheritedno
PercentagesThe 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 percentage value is treated as 0.
Mediavisual
Computed valuethe percentage as specified or the absolute length
Animation typea length, percentage or calc();
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Syntax

Values

<length>
The minimum height, expressed as a <length>. Negative values make the declaration invalid.
<percentage>
The minimum height, expressed as a <percentage> of the containing block's height. Negative values make the declaration invalid.

Keyword values

auto
The default minimum height for flex items, providing a more reasonable default than 0 for other layouts.
max-content
The intrinsic preferred height.
min-content
The intrinsic minimum height.
fill-available
The containing block's height minus the vertical margin, border, and padding. (Note that some browsers implement an ancient name for this keyword, available.)
fit-content
According to CSS3 Box, this is a synonym of min-content. CSS3 Sizing defines a more complex algorithm, but no browser implements it, even in an experimental way.

Formal syntax

<length> | <percentage> | auto | max-content | min-content | fit-content | fill-available

Examples

table { min-height: 75%; }

form { min-height: 0; }

Specifications

Specification Status Comment
CSS Intrinsic & Extrinsic Sizing Module Level 3
The definition of 'min-height' in that specification.
Working Draft Adds the max-content, min-content, fit-content, and fill-available keywords. (Both CSS3 Box and CSS3 Writing Modes drafts used to define these keywords, but are superseded by this spec.)
CSS Flexible Box Layout Module
The definition of 'min-height' in that specification.
Candidate Recommendation Adds the auto keyword and uses it as the initial value.
CSS Transitions
The definition of 'min-height' in that specification.
Working Draft Defines min-height as animatable.
CSS Level 2 (Revision 1)
The definition of 'min-height' in that specification.
Recommendation Initial definition.

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 1.0 (Yes) 3.0 (1.9) 7.0 [3] 4.0 1.0
2.0.2 (416) for positioned elements
applies to <table> [1] No support No support (Yes) No support (Yes) No support
max-content, min-content, fit-content, and fill-available No support No support No support No support No support 9
autoObsolete since Gecko 22 21.0 ? 16.0 (16.0) No support 12.10 No support
auto as initial valueObsolete since Gecko 22 21.0 ? 18.0 (18.0) No support 12.10 No support
Feature Android Edge Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support ? (Yes) ? ? ? 9

[1] CSS 2.1 explicitly leaves the behavior of min-height with <table> undefined. Therefore any behavior is CSS2.1-compliant; newer CSS specifications may define this behavior, so Web developers shouldn't rely on a specific one now.

[2] Due to bug (bug 307866) Firefox doesn't handle min-height on elements with display: table-*.

[3] In Internet Explorer 10-11 (but not 12+), a min-height declaration on a column-direction flex container doesn't apply to the container's flex items. See Flexbug #3 for more info.

See also