css3_sel-nth.css Example File

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 img {
     position            : absolute;
     width               : 48px;
     height              : 48px;
     padding             : 0.25em;
     border              : #ffffff medium solid;
     border-radius       : 0.5em;
 }

 /* columns */
 img:nth-of-type(4n-3)       { left    : 2% }
 img:nth-of-type(4n-2)       { left    : 27% }
 img:nth-of-type(4n-1)       { left    : 52% }
 img:nth-of-type(4n-0)       { left    : 77% }

 /* rows */
 img:nth-of-type(n)          { top    : 5% }
 img:nth-of-type(n+5)        { top    : 20% }
 img:nth-of-type(n+9)        { top    : 35% }
 img:nth-of-type(n+13)       { top    : 50% }
 img:nth-of-type(n+17)       { top    : 65% }
 img:nth-of-type(n+21)       { top    : 80% }