first and second child css code example

Example 1: css odd even child

tr:nth-child(even) {background: #CCC}
tr:nth-child(odd) {background: #FFF}

Example 2: child css

p:nth-child(2)
 	{     
 		background: red;
 	}

Example 3: nth of type for every 4th after the 1st

:nth-of-type(4n+1)

Example 4: select first 5 child css

li:nth-child(-n+5) {
    color: green;   
}