In the previous tutorial, we look at how to use inline styling and internal style sheets to change the colour of text and apply some basic CSS formatting to a web page. However, what if you want to apply a theme to several pages across a web page? Won’t it be difficult to manually update the styling in every single page if you want to modify the theme? Well, we can use external style sheets to solve that problem.

By using external style sheets, we store the CSS properties and values inside a separate file eg. stylesheet.css and we reference that style sheet in every HTML file we want to apply the style to. The image below shows how to reference a CSS file: