Line chart clicked point displays nothing on dark background

Could you please remove the hardcoded color and make it possible to pass as a parameter? 
This one:

<img width="709" height="332" alt="Image" src="https://github.com/user-attachments/assets/11a7ca38-5391-4f63-8430-347a09af6048" />


<img width="740" height="209" alt="Image" src="https://github.com/user-attachments/assets/8c58c4fb-a8c7-4915-945a-0caca6ab7298" />