Answers for "n element selector"

nth-child() css

/* Selects the second <li> element in a list */
li:nth-child(2) { 
  color: lime;
}

/* Selects every fourth element
   among any group of siblings */
:nth-child(4n) {
  color: lime;
}

css nth child

:nth-child(1) { /*advantage is you can do it for 2nd, 3rd etc. */
	/* styles go here*/  
}