[TYPO3] modifying style of content elements

[Nagita Karunaratne]

This is seems like a real stupid questions but when I include
CSS-styled-content with a template, a stylesheet is placed in the typo3temp
directory and is included with all pages.

This stylesheet is a cookie cutter sheet that controls the style of the
standard content element.

If I want to change anything do I have to add another stylesheet that
overrides this or do I replace this stylesheet (in the typo3temp directory)?

If I replace it how do I get my version included?

Thanks,
Nagita