It is the simplest method to maintain the code and edit only one file for changes to have effect site-wide. The rules only apply to that page, but you can configure CSS classes and IDs that can be used to style multiple elements in the page code. using a CSS can be used in various ways in HTML. How to add comments in the style sheet blocks, Indicate what character set the style sheet written in with CSS, What are the ways to include style sheet rules in an HTML document, Style to highlight active HTML anchor with CSS. This is very useful when you want to give a specific page, his own custom style. To embed and apply an Internal Style Sheet, 1.Write the CSS open tag i.e.