18 Jul 2012
06 Sep 2008
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as far as I know the asp.net placeholder controls do not create divs, they merely replace themselves with the content from the derived pages which populate them. So if you wish to have a contentplaceholder hold content that needs to be wrapped globally in a specific div, then you would wrap that placeholder in a div.
regarding each module, while it is necessary for you to style each indidivual control (such as the newsview, blogview, etc) they are all derived from the same generic content module, so once you style one the process is similar to style the remaining ones. Additionally, you could simply go into each control and apply your own custom styling (div tags, css classes etc). each module has its associated control template in the /sitefinity/controltemplates/<module> folder.
hope this was helpful!