diff --git a/ui/overflow.go b/ui/overflow.go
index abc2df4..037796b 100644
--- a/ui/overflow.go
+++ b/ui/overflow.go
@@ -17,6 +17,7 @@ type overflow struct {
 	offset   geom.PointF32
 	parent   Control
 	content  Buffer
+	proxied  Control
 
 	hor *Scrollbar
 	ver *Scrollbar
@@ -84,7 +85,7 @@ func (o *overflow) Arrange(ctx Context, bounds geom.RectangleF32, offset geom.Po
 	}
 	if ver {
 		o.ver.ContentLength = o.desired.Y
-		o.ver.Arrange(ctx, geom.RectF32(bounds.Min.X+contentW, bounds.Min.Y, bounds.Max.X, bounds.Max.Y), offset, o)
+		o.ver.Arrange(ctx, geom.RectF32(bounds.Min.X+contentW, bounds.Min.Y, bounds.Max.X, bounds.Min.Y+contentH), offset, o)
 	}
 }
 
@@ -95,6 +96,11 @@ func (o *overflow) DesiredSize(ctx Context) geom.PointF32 {
 }
 
 func (o *overflow) Handle(ctx Context, e Event) {
+	if o.Content != o.proxied {
+		o.hor.ContentOffset = 0
+		o.ver.ContentOffset = 0
+		o.proxied = o.Content
+	}
 	hor, ver := o.shouldScroll(o.bounds)
 	if hor {
 		o.hor.Handle(ctx, e)
diff --git a/ui/scrollbar.go b/ui/scrollbar.go
index 7d80ec2..27fe8bb 100644
--- a/ui/scrollbar.go
+++ b/ui/scrollbar.go
@@ -55,6 +55,7 @@ func (s *Scrollbar) Handle(ctx Context, e Event) {
 }
 
 func (s *Scrollbar) Render(ctx Context) {
+	ctx.Renderer().FillRectangle(s.bounds, RGBA(0, 0, 0, 1))
 	s.handle.Render(ctx)
 }
 
diff --git a/ui/stackpanel.go b/ui/stackpanel.go
index a69d191..662753f 100644
--- a/ui/stackpanel.go
+++ b/ui/stackpanel.go
@@ -79,7 +79,7 @@ func (p *StackPanel) Render(ctx Context) {
 	var bounds = p.Bounds()
 	for _, child := range p.Children {
 		var childB = child.Bounds()
-		if childB.Min.X >= bounds.Max.X || childB.Min.Y >= bounds.Max.Y || childB.Max.X < bounds.Min.X || childB.Max.Y < bounds.Min.Y {
+		if childB.Min.X >= bounds.Max.X || childB.Min.Y >= bounds.Max.Y || childB.Max.X < bounds.Min.X || childB.Max.Y < bounds.Min.Y || childB.Max.X < 0 || childB.Max.Y < 0 {
 			continue
 		}
 		child.Render(ctx)