margin-bottom

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.

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

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

Syntax

/* <length> 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 */

/* 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 <length>, or a <percentage>. Its value can be positive, zero, or negative.

Values

<length>: The size of the margin as a fixed value.
<percentage>: 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 value	0
Applies to	all elements except internal table elements, ruby base containers, and ruby annotation containers
Inherited	no
Computed value	the keyword auto or a computed <length-percentage> value
Animation type	by computed value type

Formal syntax

<length-percentage> | auto

Examples

Setting positive and negative bottom margins

HTML

<div class="container">
  <div class="box0">Box 0</div>
  <div class="box1">Box 1</div>
  <div class="box2">Box one's negative margin pulls me up</div>
</div>

CSS

CSS for divs to set margin-bottom and height

.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

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

css properties margin-bottom