Hi, Arndt

Thanks for showing interest in WpDataTables

You can use conditional formatting to assign a CSS class to a specific cell,

 then add a custom CSS that would change the style of the cell as you wish.

More details with example on this link https://wpdatatables.com/documentation/table-features/conditional-formatting/

To change the font colour for example you will need to add a custom class (for example customcolor) and define that class in the Custom CSS tab like this

table.wpDataTable td.customcolor {
color: white !important;
}

I hope this helps, do let me know if you need any further assistance.