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This may be helpful to you:

http://xenforo.com/community/resources/responsive-adsense.2084/

You may also want to read up on media queries:

https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Media_queries

XenForo also has style properties for the various widths that you can use in your media queries:

http://xenforo.com/community/threads/responsive-design.50888/

Tips:

• Inline styling, major no-no (in general, but more specifically) in responsive.
• You will define your classes multiple times using media queries, with different definitions each time (so, ad-block will be defined 3 times for each of the various sizes)