Customise row hover and rowSelect in React

The mui-datatable is amazing. However, I am having issues with some of the customisation.
Is it possible to change the hover and rowSelect color for ReactJs?

I can see that the hover selector is at .MultiTableRow-root.MultiTableRow-hover: hover but can not seems to override the backgroundColor using createMuiTheme. I need to be able to change the color for both the hover and rowSelect selectors.

Finally is it possible to show and keep the Search bar open?

I am building the components using React and Storybook.js and if I am able to solve these, I will put them in GitHub and link back from here to show others how to do it.

Thank you.

Versions:
mui-database: 2.5.1
react: 16.8.6
storybook/react: 5.1.9