When a browser reads a style sheet, it will format the document according to the information in the style sheet.
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 <link> element. The <link> element goes inside the head section,
<head>
<link rel="stylesheet" type="text/css" href="style.css">
</head>
<link rel="stylesheet" type="text/css" href="style.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. An example of a style sheet file called "Style.css", is shown below,
body {
background-color: lightblue;
}
h1 {
color: navy;
margin-left: 20px;
}
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 <style> element, inside the head section
of an HTML page,
<head>
<style>
body {
background-color: linen;
}
h1 {
color: maroon;
margin-left: 40px;
}
</style>
</head>
<style>
body {
background-color: linen;
}
h1 {
color: maroon;
margin-left: 40px;
}
</style>
</head>
Inline Styles
An inline style may be used to apply a unique style for a single element.
An inline style loses many of the advantages of a style sheet (by mixing content with presentation). Use this method sparingly!
To use inline styles, add the style attribute to 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 <h1> element,
<h1 style="color:blue;margin-left:30px;">This is a heading.</h1>
Multiple Style Sheets
If some properties have been defined for the same selector in different style sheets, the value will be inherited from the more specific style sheet.
For example, assume that an external style sheet has the following properties for the <h1> element,
h1 {
color: navy;
margin-left: 20px;
}
color: navy;
margin-left: 20px;
}
then, assume that an internal style sheet also has the following property for the <h1> element,
h1 {
color: orange;
}
color: orange;
}
If the page with the internal style sheet also links to the external style sheet the properties for the <h1> element will be
color: orange;
margin-left: 20px;
margin-left: 20px;
The left margin is inherited from the external style sheet and the color is replaced by the internal style sheet.
" Note: If the link to the external style sheet is placed below the internal style sheet in HTML <head>, the external style sheet will override the internal style sheet "
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