<form id="contactForm" class="box-contact_form" method="POST" action="./mail.php">
                  <div class="form-group">
                    <label for="field-name"></label>
                    <input type="text" class="form-control" name="name"  required id="field-name"  placeholder="Imię i Nazwisko*" data-error="Wypełnij to pole" pattern="[a-zA-ZąĄććę곣ńŃóÓśŚżŻŹŹ ]+" oninvalid="this.setCustomValidity('Wypełnij poprawnie to pole')"
                    oninput="setCustomValidity('')" data-validation-error-msg="Wypełnij poprawnie to pole">
                  </div>
                  <div class="form-group">
                    <label for="field-tel"></label>
                    <input type=" number" class="form-control" name="phone" required id="field-phone" placeholder="Telefon*"  maxlength="15" oninvalid="this.setCustomValidity('Wypełnij poprawnie to pole')"
                    oninput="setCustomValidity('')" data-validation-error-msg="Wpisz poprawny numer telefonu">
                  </div>
                  <div class="form-group">
                    <label for="field-email"></label>
                    <input type="email" class="form-control" name="email" id="field-email" data-validation="email"  pattern="[^@\s]+@[^@\s]+\.[^@\s]+" aria-describedby="emailHelp" placeholder="E-mail" data-validation-error-msg="Wpisz poprawny adres E-mail">
                  </div>
                  <div class="form-group">
                    <label for="field-message"></label>
                    <textarea class="form-control" name="message" id="field-message" pattern=".+" rows="3" placeholder="Jak możemy Ci pomóc?"></textarea>
                  </div>
                  <button type="submit" id="submit" class="btn btn-primary">Wyślij</button>
                </form>