JSFiddle - React, Tailwind, and code Playground

HTML

<table>
<tr><td>ligne1</td></tr>
<tr><td>ligne2</td></tr>
<tr><td>ligne3</td></tr>
<tr><td>ligne4</td></tr>
<tr><td>ligne5</td></tr>
<tr><td>ligne6</td></tr>
</table>

CSS

tr:nth-child(2n){
 background:yellow; 
}

tr:nth-child(2n+1){
 background:red; 
}