This video will teach you what is internal CSS and Inline CSS and External CSS with examples. Internal and External Examples. The format of the CSS is the same as the format of the CSS in the internal or embedded styling, but the CSS rules of an external stylesheet will apply to every HTML page that links to the stylesheet, which makes it very easy and convenient to uniformly style many elements across many different pages, and to make changes to your CSS to optimize your site for mobile and different sized viewports. updated on February 23, 2017. Inline CSS is used to style a specific HTML element. 2) Embedded CSS using the style tags between the head tags can override any CSS style change from the external CSS file for the page it's used on only. Internal or embedded CSS requires you to add