Applying styles to Spreadsheet

[appukuttan-shailesh]

I have just started using react-spreadsheet in my app. I do not use TypeScript.
I am trying to apply styling similar to the demo app (e.g. having fixed size column widths, black color text for row and col labels).

On going through the docs I find that I probably should set this under HeaderRowProps
https://iddan.github.io/react-spreadsheet/docs/api#headerrowprops

But I am not very certain how to set the value for this.... how do I specify the styles? Are there any examples you could point me to?