响应显示整个屏幕上的小图片

I have a picture (dimension 320px X 480px) of same size like normal phone device size. I want to make the display responsive for this picture. I want to display the picture as it is in the mobile device. While, I want to show the image in the center in the desktop (and in other big) devicesI have a picture (dimension 320px X 480px) of s