Customised Look & Feel of Sonarqube Dashboard

I want to change the font & colors of homepage of Sonarqube dashboard as per my company standards. I am using 8.3.1 licensed version of Sonarqube Enterprise Edition. I know I can add company logo in home screen using Look & Feel option of Sonarqube, I also want to add color to the top bar (instead of black) So to create the home page look like other inhouse tools applying standards.

I tried finding ways for same but unable to change CSS of the source page, let me know if there is any plugin which can be helpful to me here.

Thanks in advance,