diff --git a/playground/charts/ChartView.cpp b/playground/charts/ChartView.cpp
index afd3a89d..6e581d15 100644
--- a/playground/charts/ChartView.cpp
+++ b/playground/charts/ChartView.cpp
@@ -159,7 +159,7 @@ namespace
             setBoxBorderColorsHint( Inherited::Handle, Qt::white );
             if(skinStates().testFlag(Alpha)) 
             {
-                m_color.setAlpha(value);
+                m_color.setAlpha(value * 255);
             }
             else 
             {
@@ -413,6 +413,8 @@ namespace
 ChartView::ChartView( ArcControl* chart, QQuickItem* parent )
     : QskMainView( parent )
 {
+    setColor(Panel, Qt::white);
+
     auto hBox = new QskLinearBox( Qt::Horizontal );
 
     // auto chartBox = new ChartBox( chart, hBox );
@@ -469,7 +471,9 @@ ChartView::ChartView( ArcControl* chart, QQuickItem* parent )
         [ = ]( QColor c ) { chart->setColor( subcontrol, c ); } );
 
     connect( controlPanel, &ControlPanel::shadowColorChanged, chart,
-        [ = ]( QColor c ) { chart->setShadowColorHint( subcontrol, c ); } );
+        [ = ]( QColor c ) { 
+            chart->setShadowColorHint( subcontrol, c ); 
+        } );
 
     connect( controlPanel, &ControlPanel::strokeColorChanged, chart,
         [ = ]( QColor c ) { 
diff --git a/src/nodes/shaders/arcshadow-vulkan.frag b/src/nodes/shaders/arcshadow-vulkan.frag
index 69a6929e..21f01210 100644
--- a/src/nodes/shaders/arcshadow-vulkan.frag
+++ b/src/nodes/shaders/arcshadow-vulkan.frag
@@ -48,5 +48,5 @@ void main()
     float d = sdRing(p, cs, ubuf.radius / 2.0, ubuf.thickness);
 
     float a = 1.0 - smoothstep(0.0, ubuf.extend, d);
-    fragColor = vec4(ubuf.color.rgb, 1.0) * a * ubuf.opacity;
+    fragColor = ubuf.color * a * ubuf.opacity;
 }
\ No newline at end of file
diff --git a/src/nodes/shaders/arcshadow.frag b/src/nodes/shaders/arcshadow.frag
index 2d44a320..5ad0e2a7 100644
--- a/src/nodes/shaders/arcshadow.frag
+++ b/src/nodes/shaders/arcshadow.frag
@@ -43,5 +43,5 @@ void main()
     float d = sdRing(p, cs, radius / 2.0, thickness);
 
     float a = 1.0 - smoothstep(0.0, extend, d);
-    gl_FragColor = vec4(color.rgb, 1.0) * a * opacity;
+    gl_FragColor = color * a * opacity;
 }
\ No newline at end of file
diff --git a/src/nodes/shaders/arcshadow.frag.qsb b/src/nodes/shaders/arcshadow.frag.qsb
index 435e2fe9..3eb9ca6c 100644
Binary files a/src/nodes/shaders/arcshadow.frag.qsb and b/src/nodes/shaders/arcshadow.frag.qsb differ