Key Points
Modifying the look and feel of a SharePoint site means you have to modify the CSS behind that SharePoint site.
SharePoint pages consist primarily of controls that make it difficult to know what needs to be modified in the CSS.
Making changes to core.css in SharePoint would affect every site in the site collection if not for the SharePoint Designer feature that pulls down a copy of core.css and fixes the link in the CSS link control.
Figuring out how an object is styled and then figuring out why a change you made is not showing up can be a complex process.
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