margin-bottom

Baseline Widely available *

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

* Some parts of this feature may have varying levels of support.

The margin-bottom CSS property sets the margin area on the bottom of an element. A positive value places it farther from its neighbors, while a negative value places it closer.

Try it

margin-bottom: 1em;

margin-bottom: 10%;

margin-bottom: 10px;

margin-bottom: 0;


  

    

    

    

  




#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;
}

The effect of the CSS margin-bottom property on the element box

This property has no effect on non-replaced inline elements, such as or .

Syntax

css
/*  values */
margin-bottom: 10px; /* An absolute length */
margin-bottom: 1em; /* relative to the text size */
margin-bottom: 5%; /* relative to the nearest block container's width */
margin-bottom: anchor-size(width);
margin-bottom: calc(anchor-size(--myAnchor self-block, 20px) / 3);

/* Keyword values */
margin-bottom: auto;

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

The margin-bottom property is specified as the keyword auto, or a , or a . Its value can be positive, zero, or negative.

Values

The size of the margin as a fixed value.

The size of the margin as a percentage, relative to the inline size (width in a horizontal language, defined by writing-mode) of the containing block.

auto

The browser selects a suitable value to use. See margin.

Formal definition

Initial value0
Applies toall elements, except elements with table display types other than table-caption, table and inline-table. It also applies to ::first-letter.
Inheritedno
Percentagesrefer to the width of the containing block
Computed valuethe percentage as specified or the absolute length
Animation typea length

Formal syntax

margin-bottom = 
    |
  auto                 |
        

 = 
        |
    

 = 
  anchor-size( [  ||  ]? , ? )  

 = 
    

 = 
  width        |
  height       |
  block        |
  inline       |
  self-block   |
  self-inline

Examples

Setting positive and negative bottom margins

HTML

html

  
Box 0

  
Box 1

  
Box one's negative margin pulls me up

CSS

CSS for divs to set margin-bottom and height

css
.box0 {
  margin-bottom: 1em;
  height: 3em;
}
.box1 {
  margin-bottom: -1.5em;
  height: 4em;
}
.box2 {
  border: 1px dashed black;
  border-width: 1px 0;
  margin-bottom: 2em;
}

Some definitions for container and divs so margins' effects can be seen more clearly

css
.container {
  background-color: orange;
  width: 320px;
  border: 1px solid black;
}
div {
  width: 320px;
  background-color: gold;
}

Result

Specifications

Specification
CSS Box Model Module Level 3
# margin-physical

Browser compatibility

See also