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handy feature "inspect element" through context menu in Chrome or with FireBug plugin/extension
once you get grip on positioning and floats and how thing stack up depending on various position & display settings, it becomes easy.
my personal fav is absolute positioned item in a relative positioned item
in css you can refer to classes and ids very flexibly, you can refer to particular tag in particular class/id for instance.
never use same id more than once on a single page.
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