How to Add custom CSS to my wordpress page and use that css only on my android app webview

Iam trying to design a android app of my wordpress website www.pocketdoctors.in which is a Listings page(Not a Blog) so Iam using webview as main concept in my app but a lot of changes has to be made for an app view like Removing header and footer and menus etc. on App alone. Changes should not show up in Mobile browser.
Thank You If any One helped