private function getSelectedThemeMarkup($theme) {
    $form['name_markup'] = [
      '#type' => 'markup',
      '#markup' => $theme['name'],
      '#prefix' => '<h3>',
      '#suffix' => '</h3>',
    ];
    $form['desc_markup'] = [
      '#type' => 'markup',
      '#markup' => $theme['description'],
      '#prefix' => '<div class="desc_markup">',
      '#suffix' => '</div>',
    ];
    $form['screenshot_markup'] = [
      '#prefix' => '<div> <img src="' . base_path() . $theme['screenshot']['uri'] . '" width="294">',
      '#suffix' => '</div>',
    ];
    return $form;
  }