Create a wrapper div within field groups on node displays
Try hook_field_group_build_pre_render_alter() since node content solution seems not longer working.

/**
 * Implements hook_field_group_build_pre_render_alter().
 * Adds additional wrappers
 */
function [your_theme_or_module_name]_field_group_build_pre_render_alter(&amp;$element) {
  if (!empty($element['group_tabs'])) {
    $element['group_tabs']['#prefix'] = '&lt;div class="field-group-container"&gt;';
    $element['group_tabs']['#prefix'] .= '&lt;div class="field-group-row"&gt;';
    $element['group_tabs']['#suffix'] .= '&lt;/div&gt;&lt;/div&gt;';
  }
}


Check Field group for developers for more info.