Original Resolution: 900x600
Viewport Resolution Screen Size And Dpi For The Most Popular Smartphones 320 x 480 pt (iphone 4), 320 x 568 pt (iphone 5), 375 x 667 pt (iphone 7), 414 x 736 pt (iphone 7 plus)and 375 x 842 pt then when retina screens came along, 1pt became 2px.
