.webform-submission-add-form #edit-civicrm-1-activity-1-activity-activity-type-id {
  display: none;
}

.webform-submission-add-form #edit-civicrm-1-activity-1-activity-duration {
  display: none;
}

.webform-submission-add-form #edit-civicrm-2-contact-1-contact-organization-name {
  display: none;
}

.webform-submission-add-form #edit-civicrm-4-contact-1-fieldset-fieldset {
  display: none;
}