More than likely, you probably haven’t noticed, but Windows Phone 7 devices don’t fully support media queries (used mostly for responsive and adaptive designs). However, media queries can be used for designs presented on Windows Phone, you just have to know how to do it.
For the most part, I have seen designers and developers include media queries within their stylesheet(s). Windows Phone 7 will ignore media queries directly in your CSS. Instead, you have to set up separate stylesheets for each media query. For instance, rather than having the following code in your main stylesheet: