I went to look at the privilege descriptions as a result of a different question (e.g. https://english.stackexchange.com/privileges/edit ) and the "Reputation Required" box has its right boundary drawn incorrectly:
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body.privileges-page #sidebar { width: 240px; }is to blame (width is 220px in the sidebars elsewhere on the site) – Cameron Jan 7 '13 at 21:44