Lets talk about Responsive Adsense Code now. Google allows you to modify Responsive Adsense code with certain restrictions. Responsive Code can be split into 4 parts as shown in below image.
A - CSS declaration for your Responsive Ads
CSS Styles are specified here. "@media(min-width" is where all magic is happening. Amazingly CSS media query is supported by major browsers.
This applies to all screen types and checks the min-width of the display (browser/screen).
This asynchronous code does not need <script> tags now. Don't change anything here. This defines all your Responsive adsense data.
While I think there is lot to know here but I left it for later experiment !