You need to see a fast CSS example. You are just learning how to create a website. Let's get right to it.
<link rel="stylesheet" type="text/css" href="css-example-external-style-sheet.css">That line of code tells your browser to use the external stylesheet css-example-external-style-sheet.css to style css-example-web-page.html. It is called an external style sheet because the styles are in a separate file as opposed to being in the HTML of the page.
New to CSS? See this related article: CSS Tutorial for Beginners.
Style sheets can be a little tricky in more complicated page layouts. But, once you get things set up, using CSS is a breeze. When you change your site you will be sooooo happy that you took the time to set the stylesheet up. As you know, if you change a style in the stylesheet it changes the style of every HTML page that is linked to it... fast.
How did you do with the CSS example above? Don't worry if you didn't get everything. You will. Better yet, try another CSS example now!
CSS is very simple in theory.
The trouble is that not all browsers calculate and display styles the same way.
Always be sure to test your CSS in the most popular browsers.