how to resize an image changing the size resolution of the page

I found this pages: and

If you change the size resolution of your browser you will see that the the image remains in the center.

And also if you increase the size resolution of your browser you will see new parts of the same image

I would like to know how to do that to my page.
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Kyle HamiltonData ScientistCommented:
it's a background image with centered positioning.

something like this:


   background:url(big-image.jpg) center center no-repeat;
altariamx2003Author Commented:
I tried that but the background image remains in the same place no matter what wich resolution I use

check this:

resolution: 1920x1080
resolution: 1920x1080

resolution: 1280x720
as you can see with the lower resolution the background image remains in the center of the screen

I would like to do something like that
altariamx2003Author Commented:
could this workk???

   background : url(big-image.jpg) no-repeat fixed center center transparent;


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Kyle HamiltonData ScientistCommented:
here's an example:

this works exactly like the two websites you posted. view source.

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altariamx2003Author Commented:
it works!!

Kyle HamiltonData ScientistCommented:
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