Cascading Style Sheets

CSS or cascading style sheets is a way to format web pages which separates the content from the actual style or look of the page.

Benefits

It is easy to give web pages a consistent look
The styles you create can be applied to any page in your website
It is easy to change the look of a website because you only have to update one css file

Limitations

Not all browsers interpret CSS in the same way.
You may achieve a look you like, only to find that it displays correctly in Interent Explorer but not in Firefox.

Things to think about

Cascading style sheets are created using a text or HTML editor.
You need a good understanding of HTML
You should test your style sheets in at least two browsers. For instance, Chrome, Edge, Internet Explorer, Firefox, Opera, or Safari

Applying Styles using selectors

The selector is what you want the style to apply to.

A selector could be:

an html tag (body, a, li, td etc.)
a user defined class
the name or id given to an html tag