All pop-up pages are full width

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Since begin of the week all the pop-up pages ( including the login dialog ) are full width. ( I've deleted my browser history ) Checking css via the element inspector of Chrome there is now always element.style on top. Where comes this element.style from?
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1 answers
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Should something in CSS, deleted my theme and restore a backup. For my it is solved. How it happend? I don't know. I didn't modify nothing in the css since the backup.

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