adding thick separator to navigation bar and bottom panel

main.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"fyne.io/fyne/v2/app"
+	"fyne.io/fyne/v2/theme"
 	"github.com/20after4/configdir"
 	"github.com/zalando/go-keyring"
 )
@@ -28,6 +29,7 @@ func main() {
 	}
 
 	fyneApp := app.New()
+	fyneApp.Settings().SetTheme(theme.DarkTheme())
 	mainWindow := ui.NewMainWindow(fyneApp, appname, myApp)
 
 	// TODO: There is some race condition with running this initial startup

ui/bottompanel.go

@@ -100,8 +100,9 @@ func NewBottomPanel(p *player.Player) *BottomPanel {
 		_ = p.SetVolume(v)
 	}
 
-	bp.container = container.New(newBottomPanelLayout(500, bp.NowPlaying, bp.Controls, bp.AuxControls),
+	main := container.New(newBottomPanelLayout(500, bp.NowPlaying, bp.Controls, bp.AuxControls),
 		bp.NowPlaying, bp.Controls, bp.AuxControls)
+	bp.container = container.NewBorder(widgets.NewThickSeparator(), nil, nil, nil, main)
 	return bp
 }
 

ui/browsingpane.go

@@ -57,7 +57,10 @@ func NewBrowsingPane(app *backend.App) *BrowsingPane {
 	b.forward = widget.NewButtonWithIcon("", theme.NavigateNextIcon(), b.GoForward)
 	b.curPage = &blankPage{}
 	b.container = container.NewBorder(
-		container.NewHBox(b.back, b.forward, b.searchBar),
+		container.NewVBox(
+			container.NewHBox(b.back, b.forward, b.searchBar),
+			widgets.NewThickSeparator(),
+		),
 		nil, nil, nil, b.curPage)
 	return b
 }

ui/widgets/thickseparator.go

@@ -0,0 +1,28 @@
+package widgets
+
+import (
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/canvas"
+	"fyne.io/fyne/v2/theme"
+	"fyne.io/fyne/v2/widget"
+)
+
+type ThickSeparator struct {
+	widget.BaseWidget
+	line canvas.Line
+}
+
+func NewThickSeparator() *ThickSeparator {
+	t := &ThickSeparator{
+		line: canvas.Line{
+			StrokeWidth: 3,
+			StrokeColor: theme.DisabledColor(),
+		},
+	}
+	t.ExtendBaseWidget(t)
+	return t
+}
+
+func (t *ThickSeparator) CreateRenderer() fyne.WidgetRenderer {
+	return widget.NewSimpleRenderer(&t.line)
+}