What is CSS?

CSS stands for Cascading Style Sheets
CSS is a stylesheet represent how the HTML element is displayed on the screen/web page

Referencing CSS

1) External method:

CSS is in separate file with .css extension.
CSS is Added to the head element.
CSS Uses tag and two attributes, rel and href. Rel for a relationship with a value of stylesheet and the href is to link to actual CSS files.
Note: CSS does not need a closing tag as it is a void element.

2) Inline CSS:

It can be added to any HTML document with the style attribute.
Example :

<p style="color: red;">This text is red</p>

1	<p style="color: red;">This text is red</p>

3) Internal CSS
All CSS is written between opening and closing style tag.