How to add CSS to a web page

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What ways can I use a style sheet in a page? How to add CSS to a webpage?

When a browser reads a style sheet, it will format the document according to it. There are three ways of inserting a style sheet:

External Style Sheet

An external style sheet is ideal when the style is applied to many pages. With an external style sheet, you can change the look of an entire Web site by changing one file. Each page must link to the style sheet using the <link> tag. The <link> tag goes inside the head section:

css code

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

The browser will read the style definitions from the file mystyle.css, and format the document according to it.

Internal Style Sheet

An internal style sheet should be used when a single document has a unique style. You define internal styles in the head section by using the <style> tag, like this:

css code

<head>
<style type="text/css">
hr {color: sienna}
p {margin-left: 20px}
body {background-image: url("images/back40.gif")}
</style>
</head>

The browser will now read the style definitions, and format the document according to it.

Inline Styles

An inline style loses many of the advantages of style sheets by mixing content with presentation. Use this method sparingly, such as when a style is to be applied to a single occurrence of an element.

To use inline styles you use the style attribute in the relevant tag. The style attribute can contain any CSS property. The example shows how to change the color and the left margin of a paragraph:

css code

<p style="color: black; margin-left: 20px">
    A paragraph is here 
</p>

Multiple Style Sheets

If some properties have been set for the same selector in different style sheets, the values will be inherited from the more specific style sheet. For example, an external style sheet has these properties for the h3 selector:

css code

h3 
{
color: red;
text-align: left;
font-size: 8pt
}

And an internal style sheet has these properties for the h3 selector:

css code

h3 
{
text-align: right; 
font-size: 20pt
}

If the page with the internal style sheet also links to the external style sheet the properties for h3 will be:

css code

color: red; 
text-align: right; 
font-size: 20pt

The color is inherited from the external style sheet the text-alignment and the font-size is replaced by the internal style sheet.

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How to add CSS to a web page

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