There are three ways to insert CSS into an HTML document: by using an internal style sheet, inline styles, or an external style sheet. An internal style sheet applies to a single page, an inline style to a single element, and an external style sheet to potentially an entire web site.
Internal Style Sheet
An internal style sheet
is useful when a single document needs to have its own unique styling. The style sheet is then embedded within the <head> section of the web document using the <style> element. This element is a container for style sheet rules and should have its type attribute set to ...
