I have news from my DB. I would like to know how to give a color for ID even and odd? A grey for an even and a white for an odd? 

```
$req = $bdd->query('SELECT id, titre, contenu, DATE_FORMAT(date_creation, \'%d/%m/%Y à %Hh%i\') AS date_creation_fr FROM billets ORDER BY date_creation DESC LIMIT '.$depart.', '.$articlesPage);

```