How to change Jupyter notebook html output template?

[rha...@gmail.com]

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I use jupytherthemes module to change Jupyter notebook theme to solarized. For some reason, I needed to reinstall the Anaconda. After that I was not able to use jupytherthemse and I just used another custom.css file and left it in .jupyter/custom directory. My notebook theme is fine but when I export it as html, nbconver uses the old theme--solarized. I searched a lot to find a way to reset the template to the default template or to custom.css I am using for notebook. I was not able to find any solution. any thought would be much appreciated. notebook: html: