<form class="form-horizontal" role="form">
  
  <div class="form-group">
    <label for="entrer_Identifiant_3" class="col-sm-2 control-label">Identifiant</label>
    <div class="col-sm-10">
      <input type="identifiant" class="form-control" id="Entrer_Identifiant_3" placeholder="Votre identifiant">
    </div>
  </div>

  <div class="form-group">
    <label class="sr-only" for="entrer_mot_de_passe_3">Mot de passe</label> <!-- "col-sm-2 control-label" ou "sr-only" -->
    <div class="col-sm-10">
      <input type="mot de passe" class="form-control" id="entrer_mot_de_passe_3" placeholder="Votre mot de passe">
    </div>
  </div>
  
  <div class="form-group">
    <div class="col-sm-offset-2 col-sm-10">
      <div class="checkbox">
        <label>
          <input type="checkbox"> Rester connecter
        </label>
      </div>
    </div>
  </div>
  
  <div class="form-group">
    <div class="col-sm-offset-2 col-sm-10">
      <button type="submit" class="btn btn-primary">Se connecter</button> <!-- Il faut ajouter le lien d'identification  -->
    </div>
  </div>
  
</form>