A colleague discovered a layout problem when he was using the People Search Box Web Part outside a SharePoint Search Center.
When you add the People Search Box Web Part to your page, the layout looks fine.
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The problem arises when you click on the Search Options link.
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As you can see, the property box is shown with a transparent background and the labels are almost unreadable.
Solution
To solve this problem, you could add the following CSS styles to your custom stylesheet or inside the master page itself.
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Result
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