Solution: If a particular rule should never be overridden by another rule, the !important indication should be used. For a rule never to be ignored, insert the indication !important just before the semicolon of the rule.

Solution: Self-explainatory.

Solution: A declaration has two parts separated by a colon:
Property – that part before the colon
Value – that part after the colon.

Solution: The selector is the link between the HTML document and the style. It specifies what elements are affected by the declaration. The declaration is that part of the rule that sets forth what the effect will be.

Solution: Self-explainatory.

Solution: Self-explainatory.

Solution: Earlier, you had to use images for these effects. However, by using CSS3 gradients you can reduce download time and bandwidth usage. In addition, elements with gradients look better when zoomed, because the gradient is generated by the browser.

Solution: Self-explainatory.

Solution: Author. The author specifies style sheets for a source document according to the conventions of the document language. For instance, in HTML, style sheets may be included in the document or linked externally.

Solution: User: The user may be able to specify style information for a particular document. For example, the user may specify a file that contains a style sheet or the user agent may provide an interface that generates a user style sheet (or behaves as if it did) .