JSFiddle - React, Tailwind, and code Playground

HTML

<table id="foo">
  <tr>
   <td>One</td>
  </tr>
  <tr>
   <td>Two</td>
  </tr>
  <tr>
   <td>Three</td>
  </tr>
  <tr>
   <td>Four</td>
  </tr>
  <tr>
   <td>Five</td>
  </tr>
  <tr>
   <td>Six</td>
  </tr>
</table>

CSS

table tr:nth-child(2n+0) { color: red }
table tr:nth-child(2n+1) { color: blue }
table tr:nth-child(3n+0) { color: green }