How to Set Auto Height to all type of Browser and Device

Hi Friends.,

In My Web Page height is varying for different screens (monitors) and browsers

Previously i had Declare height in pixels then the height is fixed for certain limit after that i converted into percentage it is varying from page to page (it means when content ends the height is also getting stopped or if content expands the height is also expanding) , i need to resolve this error

Actually what i need to do here is the height needs to be free as per device (monitor) height , i tried for media Query in CSS also there no changes in height Please let me get Solution Soon ASAP

Regards....,
R.V.Rajagopalan