How To Add CSS
When a browser reads a style sheet, it will format the HTML document
Three Ways to Insert CSS
There are three ways of inserting a style sheet:
External CSS
Internal CSS
Inline CSS
External CSS
With an external style sheet, you can change the look of an entire website by changing just one file.
Example
External styles are defined within the <link> element, inside the <head> section of an HTML page:
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="mystyle.css">
</head>
<body>
<h1>This is a heading</h1>
<p>This is a paragraph.</p>
</body>
</html>
Internal CSS
An internal style sheet may be used if one single HTML page has a unique style.
Example
Internal styles are defined within the <style> element, inside the <head> section of an HTML page:
<!DOCTYPE html>
<html>
<head>
<style>
body {
background-color: linen;
}
h1 {
color: maroon;
margin-left: 40px;
}
</style>
</head>
<body>
<h1>This is a heading</h1>
<p>This is a paragraph.</p>
</body>
</html>
Inline CSS
An inline style may be used to apply a unique style for a single element.
Example
Inline styles are defined within the "style" attribute of the relevant element:
<!DOCTYPE html>
<html>
<body>
<h1 style="color:blue;text-align:center;">This is a heading</h1>
<p style="color:red;">This is a paragraph.</p>
</body>
</html>
Cascading Order
All the styles in a page will "cascade" into a new "virtual" style sheet by the following rules, where number one has the highest priority,
Inline style (inside an HTML element)
External and internal style sheets (in the head section)
Browser default
Multiple Style Sheets
If some properties have been defined for the same selector (element) in different style sheets, the value from the last read style sheet will be used.
Example
Assume that an external style sheet has the following style for the <h1> element:
h1 {
color: navy;
}
Then, assume that an internal style sheet also has the following style for the <h1> element:
h1 {
color: orange;
}
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