I´m using

https://www.virtuosoft.eu/code/bootstrap-duallistbox/

for my project and I find the a way change the color in this post:

https://stackoverflow.com/a/32927607/12768865

But I need to erase the annoying blue border of the items. Here is a picture for more info... any help will be appreciated. Thanks

EDIT & ANSWER:

After some read, there is no solution available. Is a browser issue, in chrome it look fine, but firefox show the blue dots... the post can be close and I hope it helps others.