Update timeline_generator.py

timeline_generator.py

@@ -78,7 +78,7 @@ def generate_timeline_diagram(json_input: str, output_format: str) -> str:
                 shape='plaintext',
                 fontsize='18',
                 fontweight='bold',
-                fontcolor='#404040',
+                fontcolor='#000000',
                 pos="6,2!" 
             )