how to set row height in FormLayout

Hi,
Here is my code copied from the cookbook

 [code]

[i]

[/i]private Layout createForm(Item item) {
FormLayout layout = new FormLayout();
layout.setSizeFull();

        final FieldGroup group = new FieldGroup(item);
        
        Field fKod0 = group.buildAndBind("kod0");
        fKod0.setCaption("Kod");
        fKod0.setWidth("100%");
        layout.addComponent (fKod0);
        
        Field fNazwa = group.buildAndBind("nazwa");
        fNazwa.setCaption("Nazwa");
        fNazwa.setWidth("100%");
        layout.addComponent (fNazwa);

        Field fAdres = group.buildAndBind("adres");
        fAdres.setCaption("Adres");
        fAdres.setWidth("100%");
        fAdres.setStyleName("ciasny");
        layout.addComponent (fAdres);
        
        Field fNip = group.buildAndBind("nip");
        fNip.setCaption("Nip");
        fNip.setWidth("50%");
        layout.addComponent (fNip);

        TabBarView tbv = new TabBarView();
        Label nz = new Label("Nal./Zob.");
        tbv.addTab(nz, "Nal./Zob.");
        tbv.addTab(new Label("Zlecenie"), "Zlecenie");
        tbv.setHeight("100%");
        layout.addComponent(tbv);
        layout.setExpandRatio(tbv, 5.0f);


        layout.setStyleName("abrakadabra");
        return layout;
        }

[/code]Actually I made many amendments in CSS but none of them working so here is the skeleton to see the context.
CSS:

@import "../valo/valo.scss";

@mixin ezleceniatheme {
  @include touchkit;

  // Insert your own theme rules here

 .abrakadabra .v-button-wrap {
     font-size: 25px;
     color: white;
     background-color: #00A3E8;
 
 }
 .abrakadabra .v-formlayout-lastrow {
     background-color: #00A3E8;
     border: 0px;
  }
 
.ciasny .v-textfield {
font-size: 9px;
}

}

What is the way to set minimum row height ?
The data table resizes very nice for big screens, however I need it squeezed for small but it does not want to be smaller than 50px high.

Regards
Henryk