JSFiddle - React, Tailwind, and code Playground

HTML

<table id="table1">
  <tr><td></td><td></td></tr>
  <tr><td></td><td></td></tr>
  <tr><td></td><td></td></tr>
  <tr><td></td><td></td></tr>
  <tr><td></td><td></td></tr>
</table>

CSS

body {
  background: gray;
}
td {
  padding: 2em;
}

JavaScript

var tr = document.getElementById('table1').getElementsByTagName('tr'),
          i = tr.length;
    while(i--) {
        tr[i].style.backgroundColor = i%2 ? ' green' : 'white';
    }