table {border: 1px solid black;} td { border: 1px solid black; text-align:center; } table tr:nth-child(3n+2) { background-color:green; } table tr:nth-child(3n+3) { background-color:pink; } table tr:nth-child(3n+4) { background-color:red; } tr#first { background-color:yellow; } _css; echo "\n"; /////////////////////////// echo ""; echo ""; for ($i=1;$i<=12;$i++){ echo ""; for ($y=1;$y<=2;$y++){ echo ""; } echo "\n"; } echo "

Numero	Riga
"; if ($y == 1){ echo $i; } else { echo "riga " . $i; } echo"

"; include ('footer.html'); ?>