diff --git a/frontend/src/pages/admin/AnalyticsDashboard.tsx b/frontend/src/pages/admin/AnalyticsDashboard.tsx
index 7b13b84..8258c1a 100644
--- a/frontend/src/pages/admin/AnalyticsDashboard.tsx
+++ b/frontend/src/pages/admin/AnalyticsDashboard.tsx
@@ -403,7 +403,7 @@ export default function AnalyticsDashboard() {
           type: "bar" as const,
           barMaxWidth: 32,
           z: 1,
-          itemStyle: { color: "#E5E7EB", borderColor: "#9CA3AF", borderWidth: 1, borderRadius: [4, 4, 0, 0] },
+          itemStyle: { color: "transparent" },
           label: {
             show: true,
             position: "top",