Today we see an important property of CSS, Also inherited from the last version, i CSS3. I'm talking about (as you will be guessed from the title) property “z-index“.
The properties “height” and “width” impostarenno height and width, while “z-index” we need to move items into the third dimension of depth (the asse “The”). The third dimension is perpendicular to the screen and it will be easier to understand for those who know programs involving the use of levels.
Imagine the screen as a table on which lay some playing cards, in this way: (more…)