How to create a body background like : website
See the background seems to adapt to it's size, 1366 x 768 or 1024 x 768 or some other size the only scroll down that appears is vertical scroll.
What image size picture do I have to create ? and how to set the css so that it works out in all image size ? Also, I think I must have the vertical scroll down so that the three boxes might fit in the pictures.