JSFiddle - React, Tailwind, and code Playground

HTML

<table class="montableau">
    <tr>
        <td>cellule 1.1</td><td>cellule 1.2</td>
    </tr>
    <tr>
        <td>cellule 2.1</td><td>cellule 2.2</td>
    </tr>
    <tr>
        <td>cellule 3.1</td><td>cellule 3.2</td>
    </tr>
    <tr>
        <td>cellule 4.1</td><td>cellule 4.2</td>
    </tr>
    <tr>
        <td>cellule 5.1</td><td>cellule 5.2</td>
    </tr>
</table>

CSS

.montableau tr:nth-child(odd) {
    color: blue;
}

.montableau tr:nth-child(even) {
    color: red;
}