Question concerning style for a date picker

Minifab

Hi,

I m new to this community. I recently started using Automad with the Project template with a black background in Automad CMS and I was able to successfully use the "am-button" class on a button. I'm pleased with the result, but now I want to call a more attractive datepicker than the default one. As a beginner in CSS, what is the best way to achieve this?

Thanks in advance for any suggestions or advice.

https://i.imgur.com/sWw38KU.png