Use StyleNode in StockMenu

sky/engine/core/rendering/style/RenderStyle.h

Index: sky/engine/core/rendering/style/RenderStyle.h
diff --git a/sky/engine/core/rendering/style/RenderStyle.h b/sky/engine/core/rendering/style/RenderStyle.h
index 96f16f2ec40ff09d76a3172f252466536d2df99c..2c6c3621dfa354f8a21521286a592a25ac415766 100644
--- a/sky/engine/core/rendering/style/RenderStyle.h
+++ b/sky/engine/core/rendering/style/RenderStyle.h
@@ -1162,7 +1162,7 @@ public:
     static float initialBoxFlex() { return 0.0f; }
     static unsigned initialBoxFlexGroup() { return 1; }
     static unsigned initialBoxOrdinalGroup() { return 1; }
-    static EBoxSizing initialBoxSizing() { return BORDER_BOX; }
+    static EBoxSizing initialBoxSizing() { return CONTENT_BOX; }
     static float initialFlexGrow() { return 0; }
     static float initialFlexShrink() { return 1; }
     static Length initialFlexBasis() { return Length(Auto); }