anchor.diff:  val config = KorolevServiceConfig[Future, Boolean, Any](
     stateStorage = StateStorage.default(false),
     serverRouter = ServerRouter.empty[Future, Boolean],
  -  render = { case _ => 'div("Hello akka-http") }
  +  render = { case _ => 'body('div("Hello akka-http")) }
   )
   
   val korolevRoute = akkaHttpService(config).apply(AkkaHttpServerConfig())
  
positive.code: 
  [source,scala]
  -----------------------------------
  val myForm = elementId
  val pictureFieldName = "picture"
  
  'form(
  
negative.code: 
  [source,scala]
  -----------------------------------
  val loginField = elementId()
  
  ...
  
  