diff --git a/README.md b/README.md
index 2d9be8e2..9ce95961 100644
--- a/README.md
+++ b/README.md
@@ -168,6 +168,12 @@ The growth of Nubenetes reflects the acceleration of the Cloud Native ecosystem.
 
 <!-- ANNUAL_CHART_START -->
 ```mermaid
+---
+config:
+  themeVariables:
+    xyChart:
+      plotColorPalette: "#5462eb, #fb8c00"
+---
 xychart-beta
     title "Nubenetes Annual Growth Metrics (Commits vs New Refs)"
     x-axis ["2018", "2019", "2020", "2021", "2022", "2023", "2024", "2025", "2026"]
diff --git a/src/readme_updater.py b/src/readme_updater.py
index a0cf38f4..15d1f81f 100644
--- a/src/readme_updater.py
+++ b/src/readme_updater.py
@@ -101,7 +101,7 @@ def get_stats():
     growth_data.sort(key=lambda x: x["year"])
     
     # Generate Bar Chart (Mandate 3: Metric Comparison)
-    annual_chart = "```mermaid\nxychart-beta\n    title \"Nubenetes Annual Growth Metrics (Commits vs New Refs)\"\n"
+    annual_chart = "```mermaid\n---\nconfig:\n  themeVariables:\n    xyChart:\n      plotColorPalette: \"#5462eb, #fb8c00\"\n---\nxychart-beta\n    title \"Nubenetes Annual Growth Metrics (Commits vs New Refs)\"\n"
     years = [f'"{item["year"]}"' for item in growth_data]
     commits = [item["count"] for item in growth_data]
     refs = [str(int(int(item["count"]) * 4.13)) for item in growth_data]