I'm using `ExtendedList` as my list, but I would like to discard the dirt background which renders in default. I've tried to overrides the render part which contains `Screen#renderDirtBackground()`, but it failed with crash. Any help?

 

Currently stable source code without overrides renderDirtBackground : 

https://github.com/ChAoSUnItY/EkiLib/blob/1.16.3/src/main/java/com/chaos/eki_lib/gui/screen/StationSelectionScreen.java

What did the crash report say, and what does the code that crashes look like?

There is a method that allows you to get rid of it:
func_244606_c(false)

func_244606_c(false) // Disables dirt outline
func_244605_b(false) // Disables black background

Note that false disables them, whilst true enables them.