">Please provide a valid input.</div>
            </div>
          </form>
          <form>
            <div class="form-group">
              <div class="form-check"> <input class="form-check-input" type="checkbox" id="exampleCheck1" value="on"><label class="form-check-label" for="exampleCheck1">Checkbox</label></div>
            </div>
          </form>
        </div>
      </div>
    </div>
  </div>
  <div class="py-4">
    <div class="container">
      <div class="row">
        <div class="col-md-12">
 