CSS Margins | CSS for Beginners - Class 6 PDF Download

CSS Margins

• Margins are used to create space around elements, outside of any defined borders.
• The CSS margin properties are used to create space around elements, outside of any defined borders.
• With CSS, you have full control over the margins. There are properties for setting the margin for each side of an element (top, right, bottom, and left).

Margin - Individual Sides

• margin-top
• margin-right
• margin-bottom
• margin-left

All the margin properties can have the following values:

• auto - the browser calculates the margin
• length - specifies a margin in px, pt, cm, etc.
• % - specifies a margin in % of the width of the containing element
• inherit - specifies that the margin should be inherited from the parent element

Tip: Negative values are allowed.

Example
Set different margins for all four sides of a <p> element:

p {

  margin-top: 100px;

  margin-bottom: 100px;

  margin-right: 150px;

  margin-left: 80px;

}

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Margin - Shorthand Property

• To shorten the code, it is possible to specify all the margin properties in one property.
• The margin property is a shorthand property for the following individual margin properties:
  margin-top
  margin-right
  margin-bottom
  margin-left

So, here is how it works:
If the margin property has four values:

• margin: 25px 50px 75px 100px;
  • top margin is 25px
  • right margin is 50px
  • bottom margin is 75px
  • left margin is 100px

Example
Use the margin shorthand property with four values:

p {

  margin: 25px 50px 75px 100px;

}

If the margin property has three values:

• margin: 25px 50px 75px;
  • top margin is 25px
  • right and left margins are 50px
  • bottom margin is 75px

Example
Use the margin shorthand property with three values: 

p {

  margin: 25px 50px 75px;

}

If the margin property has two values:

• margin: 25px 50px;
  • top and bottom margins are 25px
  • right and left margins are 50px

Example
Use the margin shorthand property with two values: 

p {

  margin: 25px 50px;

}

If the margin property has one value:

• margin: 25px;
  • all four margins are 25px

Example
Use the margin shorthand property with one value: 

p {

  margin: 25px;

}

The auto Value

• You can set the margin property to auto to horizontally center the element within its container.
• The element will then take up the specified width, and the remaining space will be split equally between the left and right margins.

Example
Use margin: auto:

div {

  width: 300px;

  margin: auto;

  border: 1px solid red;

}

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The inherit Value

• This example lets the left margin of the <p class="ex1"> element be inherited from the parent element (<div>):

Example
Use of the inherit value:

div {

  border: 1px solid red;

  margin-left: 100px;

}

p.ex1 {

•   margin-left: inherit;

}

All CSS Margin Properties

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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 left and right margins! Only top and bottom margins!

Look at the following example:
Example
Demonstration of margin collapse:

h1 {

  margin: 0 0 50px 0;

}

h2 {

  margin: 20px 0 0 0;

}

• In the example above, the <h1> element has a bottom margin of 50px and the <h2> element has a top margin set to 20px.
• Common sense would seem to suggest that the vertical margin between the <h1> and the <h2> would be a total of 70px (50px + 20px). But due to margin collapse, the actual margin ends up being 50px.