
As you can see, the menu has a clear effect, whereas the content background is kind of a blur. And this blur effect is only to the content. For more, you can actually see the Yahoo Android application.

As you can see, the menu has a clear effect, whereas the content background is kind of a blur. And this blur effect is only to the content. For more, you can actually see the Yahoo Android application.
You will have to change the HTML structure and apply CSS 3 filter blur on the parent container while the parent content does not.
There is a more detailed post in Stack Overflow post How to apply a CSS 3 blur filter to a background image that I am setting with background-image?.