If you are looking at enhancing the css experience of the default TestNG reports, then try creating a “testng.css” in your src/test/resources (or) src/main/resources folder and see if that helps.
The idea is to override the default css file that TestNG looks for in the class path with your custom implementation.
That should help you get this sorted out !
Thanks & Regards
Krishnan Mahadevan
"All the desirable things in life are either illegal, expensive, fattening or in love with someone else!"