CSS stands for Cascading Style Sheets
CSS describes how HTML elements are to be displayed
CSS Example
<style>
body {background-color:lightblue; text-align:center;}
h1 {color:blue; font-size:40px;}
p {font-family:verdana; font-size:20px;}
</style>Click on the "Try it Yourself" button to see how it works.
CSS Syntax
A CSS rule consists of a selector and a declaration block:
The selector points to the HTML element to style (h1).
The declaration block (in curly braces) contains one or more declarations separated by semicolons.
Each declaration includes a CSS property name and a value, separated by a colon.
In the following example all <p> elements will be center-aligned, red and have a font size of 32 pixels:
Example
<style>
p {font-size:32px; color:red; text-align:center;}
</style>Same example can also be written like this:
<style>
p {
font-size: 32px;
color: red;
text-align: center;
}
</style>External Style Sheet
A CSS style sheet can be stored in an external file:
mystyle.css
body {background-color: orange; font-family:verdana}
h1 {color: white;}
p {font-size: 20px;}External style sheets are linked to HTML pages with <link> tags:
Example
<!DOCTYPE html>
<html>
<link rel="stylesheet" href="mystyle.css">
<body>
<h1>My First CSS Example</h1>
<p>This is a paragraph.</p>
</body>
</html>Inline Style
Example
<!DOCTYPE html>
<html>
<link rel="stylesheet" href="mystyle.css">
<body>
<h1>My First CSS Example</h1>
<p>This is a paragraph.</p>
<p style="font-size:25px">This is a paragraph.</p>
<p style="font-size:30px">This is a paragraph.</p>
</body>
</html>Cascading Order
If different styles are specified for HTML elements, the styles will cascade into new styles with the following priority:
- Priority 1: Inline styles
- Priority 2: External and internal style sheets
- Priority 3: Browser default
- If different styles are defined on the same priority level, the last one has the highest priority.
Example
<!DOCTYPE html>
<html>
<link rel="stylesheet" href="mystyle.css">
<style>
body {background-color: lightblue;}
</style>
<body style="background-color: olivedrab">
<h1>Multiple Styles Cascades into One</h1>
<p>Try experimenting by removing styles to see how the cascading stylesheets work.</p>
<p>Try removing the inline first, then the internal, then the external.</p>
</body>
</html>
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