message: Fix onUpdatePanelCssClasses not applying panel.container class for React
diff: @@ -41,7 +41,7 @@ export class SurveyPanel extends SurveyPanelBase {
  if (this.panel.renderWidth) rootStyle["width"] = this.panel.renderWidth;
  var bottom = this.renderBottom();
  return (
  - <div ref="root" className={this.css.panel.container} style={rootStyle}>
  + <div ref="root" className={this.panelBase.cssClasses.panel.container} style={rootStyle}>
  {title}
  {description}
  {errors}
  