Include CSS

In this tutorial, we will lean how to include CSS to your HTML pages.

There are Three Ways to Insert CSS

  • 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:

Example

using "<link>" tag inside <head>

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Example CSS</title>
    <link rel="stylesheet" type="text/css" href="style.css">

</head>
<body>

    <p class="notice box">
        This is important notice inside box
    </p>

</body>
</html>

Here is how "style.css" looks like :-

p.notice {
    color: red;
    font-weight: bold;
}
.box {
    padding: 20px;
    font-size: 13px;
}

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

Example :

<!doctype html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Example CSS</title>


    <style>
        p.notice {
            color: red;
            font-weight: bold;
        }
        .box {
            padding: 20px;
            font-size: 13px;
        }
    </style>

</head>
<body>

    <p class="notice box">
        This is important notice inside box
    </p>

</body>
</html>

Inline Styles

An inline style may be used to apply a unique style for a single element.  To use inline styles, add the style attribute to the relevant element. The style attribute can contain any CSS property.  

Example :

<h1 style="color:blue;text-align: center;">This is a heading.</h1>

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


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