As per August 2022 I have been updating the package with Tailwind CSS version 3.1.8 and I have added Dark mode. See the GitHub link for the latest release.
So I decided to make my own style file and replace the package style.css with my own based on Tailwind CSS. I created an example project in Github where you can download the style.css file but you can also pull the complete project and run a quick local webserver to test and experiment with the example select option box with search.
Small difference between the two styles. On the left the original with Bootstrap integrated and on the right my implementation with Tailwind CSS:
The example project on GitHub is switching between Normal and Dark mode by the setting on your local computer. Example of the implemented dark mode: