码农教程 - 一技在手,衣食无忧! tools

目录

CSS margin Property

❮ Previous Complete CSS Reference Next ❯

Example

Set the margin for all four sides of a <p> element to 35 pixels:

p {
  margin: 35px;
}
Try it Yourself »

More "Try it Yourself" examples below.

Definition and Usage

The margin property sets the margins for an element, and is a shorthand property for the following properties:

If the margin property has four values:

  • margin: 10px 5px 15px 20px;
    • top margin is 10px
    • right margin is 5px
    • bottom margin is 15px
    • left margin is 20px

If the margin property has three values:

  • margin: 10px 5px 15px;
    • top margin is 10px
    • right and left margins are 5px
    • bottom margin is 15px

If the margin property has two values:

  • margin: 10px 5px;
    • top and bottom margins are 10px
    • right and left margins are 5px

If the margin property has one value:

  • margin: 10px;
    • all four margins are 10px

Note: Negative values are allowed.

Show demo ❯

Default value: 0
Inherited: no
Animatable: yes, see individual properties. Read about animatable Try it
Version: CSS1
JavaScript syntax: object.style.margin="100px 50px" Try it

Browser Support

The numbers in the table specify the first browser version that fully supports the property.

Property
margin 1.0 6.0 1.0 1.0 3.5

CSS Syntax

margin: length|auto|initial|inherit;

Property Values

Value Description Demo
length Specifies a margin in px, pt, cm, etc. Default value is 0. Negative values are allowed. Read about length units Demo ❯
% Specifies a margin in percent of the width of the containing element Demo ❯
auto The browser calculates a margin Demo ❯
initial Sets this property to its default value. Read about initial
inherit Inherits this property from its parent element. Read about inherit

Margin Collapse

Top and bottom margins of elements are sometimes collapsed into a single margin that is equal to the largest of the two margins.

This does not happen on horizontal (left and right) margins! Only vertical (top and bottom) margins!

Look at the following example:

Example

p.a {
  margin: 30px 0;
}

p.b {
  margin: 20px 0;
}
Try it Yourself »

In the example above, the <p class="a"> element has a top and bottom margin of 30px. The <p class="b"> element has a top and bottom margin of 20px.

This means that the vertical margin between <p class="a"> and <p class="b"> should be 50px (30px + 20px). But due to margin collapse, the actual margin ends up being 30px!

More Examples

Example

Set the margin for a <p> element to 35 pixels for top and bottom, and to 70 pixels for right and left:

p {
  margin: 35px 70px;
}
Try it Yourself »

Example

Set the margin for a <p> element to 35 pixels for top, 70 pixels for right and left, and to 50 pixels for bottom:

p {
  margin: 35px 70px 50px;
}
Try it Yourself »

Example

Set the margin for a <p> element to 35 pixels for top, 70 pixels for right, 50 pixels for bottom, and to 90 pixels for left:

p {
  margin: 35px 70px 50px 90px;
}
Try it Yourself »

Related Pages

CSS tutorial: CSS Margin

CSS tutorial: CSS Box Model

HTML DOM reference: margin property


❮ Previous Complete CSS Reference Next ❯