JSFiddle - React, Tailwind, and code Playground

HTML

<input type="tel" id="userClientNumber" name="userClientNumber" class="check check-clientnb" required="required" placeholder="Votre numéro client" />
<input type="tel" id="userBirthDate" name="userBirthDate" class="check check-date" required="required" maxlength="8" placeholder="Votre date de naissance" data-defaulttype="number" />