CSS How To

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When a browser reads a style sheet, it will format the HTML document according to the information in the style sheet.

Three Ways to Insert CSS

There are three ways of inserting a style sheet:

  • External style sheet
  • Internal style sheet
  • Inline style

External Style Sheet

With an external style sheet, you can change the look of an entire website by changing just one file!

Each page must include a reference to the external style sheet file inside the

element. The

element goes inside the

section:

Example

<head>
<link rel="stylesheet" type="text/css" href="mystyle.css">
</head>

An external style sheet can be written in any text editor. The file should not contain any html tags. The style sheet file must be saved with a .css extension.

Here is how the "mystyle.css" looks:

body {
    background-color: lightblue;
}

h1 {
    color: navy;
    margin-left: 20px;

}

Note: Do not add a space between the property value and the unit (such as margin-left: 20 px;). The correct way is: margin-left: 20px;


 

Internal Style Sheet

An internal style sheet may be used if one single page has a unique style.

Internal styles are defined within the

Cascading Order

What style will be used when there is more than one style specified for an HTML element?

Generally speaking we can say that all the styles will "cascade" into a new "virtual" style sheet by the following rules, where number one has the highest priority:

  1. Inline style (inside an HTML element)
  2. External and internal style sheets (in the head section)
  3. Browser default

So, an inline style (inside a specific HTML element) has the highest priority, which means that it will override a style defined inside the

tag, or in an external style sheet, or a browser default value.