Inline styles are styles that are applied to a specific element within the body section of the webpage. The style will be applied to that individual element only rather than to the entire page ...
To apply a rule to multiple pages, an external style sheet is used. An external style sheet is a separate CSS file that can be accessed by creating a link within the head section of the webpage.
If you ever need to tweak the appearance of a page on your business website, you may have to modify Cascading Style Sheet code. Developers use CSS to set the size, color and other attributes of ...
Macworld

Firefox and .css

For some time I’ve taken advantage of the Style Sheet pop-up menu in the Advanced tab of Safari’s preferences to load a customized cascading style sheet (.css) for, well, doing stuff that Safari doesn ...