/**
  * This function renders the form elements when adding a customcert element.
  *
  * @param mod_customcert_edit_element_form $mform the edit_form instance
  */
 public function render_form_elements($mform)
 {
     // We want to define the width of the border.
     $mform->addElement('text', 'width', get_string('width', 'customcertelement_border'), array('size' => 10));
     $mform->setType('width', PARAM_INT);
     $mform->addHelpButton('width', 'width', 'customcertelement_border');
     // The only other thing to define is the colour we want the border to be.
     parent::render_form_element_colour($mform);
 }