Coding: CSS: Multiple Style Sheets
One of the nice things about CSS files is that they are easy to update or exchange.
Let's say you want a different style for each season. You might name your CSS files winter.css, spring.css, summer.css, and fall.css. Rather than changing the .css in the head of each page, simply replace the current season file season.css with the correct file. For example, winter.css becomes season.css. Then in the spring, spring.css is renamed season.css.