If I have an image like this (for example):

(source: tiscali.it)
with more background element for my web site, how can extract a single element with css properties?
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You should use the “CSS Sprite” method. It means that you need to create an element block width specified
widthandheight, then give it abackground-imagealong withbackground-positionandbackgorund-url, then hide everything that goes out of the boxoverflow:hidden;reference to this tutorial for example, it’s well explained there: CSS Sprite link