<form>
  <div class="order_three_confirmation">
    <label class="order_label_checkbox">
      <span class="order_checkbox"></span>
      <input type="checkbox" class="hide" name="personal_data" required>
        Соглашение о предоставлении персональных данных.
    </label>
  </div>
  <div class="order_btns">
    <button class="order_btn order_btn_prev">Назад</button>
    <b><button class="order_btn order_btn_next" type="submit">Далее</button></b>
  </div>
  </div>
</form>