margin CSS property on arvau

MDN / margin CSS property

The margin CSS shorthand property sets the margin area on all four sides of an element.

margin: 1em;

margin: 5% 0;

margin: 10px 50px 20px;

margin: 10px 50px 20px 0;

margin: 0;

<section id="default-example">
  <div id="container">
    <div class="row"></div>
    <div class="row transition-all" id="example-element"></div>
    <div class="row"></div>
  </div>
</section>

#container {
  width: 300px;
  height: 200px;
  display: flex;
  align-content: flex-start;
  flex-direction: column;
  justify-content: flex-start;
}

.row {
  height: 33.33%;
  display: inline-block;
  border: solid #ce7777 10px;
  background-color: #2b3a55;
  flex-shrink: 0;
}

#example-element {
  border: solid 10px #ffbf00;
  background-color: #2b3a55;
}

Constituent properties

This property is a shorthand for the following CSS properties:

Syntax

/* apply to all four sides */
margin: 1em;
margin: -3px;

/* top and bottom | left and right */
margin: 5% auto;

/* top | left and right | bottom */
margin: 1em auto 2em;

/* top | right | bottom | left */
margin: 2px 1em 0 auto;

/* anchor-size() values */
margin: 5% anchor-size(width);
margin: calc(anchor-size(width) / 4) 1em 0
  anchor-size(--my-anchor self-inline, 50px);

/* Keyword values */
margin: auto;

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

The margin property may be specified using one, two, three, or four values. Each value is a , a , or the keyword auto. Negative values draw the element closer to its neighbors than it would be by default.

When one value is specified, it applies the same margin to all four sides.
When two values are specified, the first margin applies to the top and bottom, the second to the left and right.
When three values are specified, the first margin applies to the top, the second to the right and left, the third to the bottom.
When four values are specified, the margins apply to the top, right, bottom, and left in that order (clockwise).

Values

: The size of the margin as a fixed value.
- For anchor-positioned elements, the function resolves to a value relative to the associated anchor element’s width or height (see Setting element margin based on anchor size).
: The size of the margin as a percentage, relative to the inline size (width in a horizontal language, defined by ) of the containing block.

auto

: The browser selects a suitable margin to use. For example, in certain cases this value can be used to center an element.

Description

This property can be used to set a margin on all four sides of an element. Margins create extra space around an element, unlike , which creates extra space within an element.

The top and bottom margins have no effect on non-replaced inline elements, such as <span> or <code>.

Horizontal centering

You can horizontally center an element within its parent by setting margin: 0 auto;.

A more common method to center an element horizontally is by setting display: flex; and justify-content: center; on a container, which centers its flex item children.

Margin collapsing

Elements’ top and bottom margins are sometimes collapsed into a single margin that is equal to the larger of the two margins. See Mastering margin collapsing for more information.

Formal definition

Formal syntax

Examples

Basic example

HTML

<div class="center">This element is centered.</div>

<div class="outside">This element is positioned outside of its container.</div>

CSS

.center {
  margin: auto;
  background: lime;
  width: 66%;
}

.outside {
  margin: 3rem 0 0 -3rem;
  background: cyan;
  width: 66%;
}

More examples

margin: 5%; /* All sides: 5% margin */

margin: 10px; /* All sides: 10px margin */

margin: 1.6em 20px; /* top and bottom: 1.6em margin */
/* left and right: 20px margin */

margin: 10px 3% -1em; /* top:            10px margin */
/* left and right: 3% margin   */
/* bottom:         -1em margin */

margin: 10px 3px 30px 5px; /* top:    10px margin */
/* right:  3px margin  */
/* bottom: 30px margin */
/* left:   5px margin  */

margin: 2em auto; /* top and bottom: 2em margin   */
/* Box is horizontally centered */

margin: auto; /* top and bottom: 0 margin     */
/* Box is horizontally centered */