Reduce titlebar height in Gnome 3.28

gtk.css

/* vsefer@x220 ~ $ cat ~/.config/gtk-3.0/gtk.css */
headerbar.default-decoration {
 padding-top: 2px;
 padding-bottom: 2px;
 min-height: 0px;
}

headerbar.default-decoration button.titlebutton {
 padding: 0px;
 min-height: 0px;
}

notebook tab {
  min-height: 0;
  padding-top: 0px;
  padding-bottom: 0px;
}

notebook tab button {
  min-height: 0;
  min-width: 0;
  padding: 2px;
  margin-top: 0px;
  margin-bottom: 0px;
}

notebook button {
  min-height: 0;
  min-width: 0;
  padding: 2px;
}