style sheets

1. EXTERNAL STYLE SHEET: a style you want to apply to many pages. Editing can be made to an entire website by just changing a single style. Each page must link to the same external style sheet.
2. INTERNAL STYLE SHEET: should be used when a single document has a unique style. 
3. INLINE STYLES: This style should be used sparingly for example to change a property such as the colour of a border.