title: How to find nth element using CSS having same id/class
body: <p>if in a DOM we have multiple elements having same id/class, then how to locate a particular one using CSS e.g if we have " div class='aa' " repeated 90 times and i want to fetch 80th element, how to do it using CSS, i know how to do it using XPath ( (//div[@class='aa'])[80] ) but don't know in CSS.</p>
  
  <p>Thanks in advance.</p>