But i can’t see the full image when i have my iPhone nor other phones i checked on using portrait style… It cuts of half the background image as seen in my screenshot..

See here : http://mobiletest.me/iphone_5_emulator/?u=http://nip10.nl

Also i feel like the caption too large in font size, thats the reason why i altered it. For me the given font size is way too big so how do i change the font size but keep it responsive on phones and tablets?