The Lesson/Topic/Quiz Table Colors module is part of the Pro Suite of modules for the Uncanny LearnDash Toolkit. It lets you change the colors of LearnDash table heading text and background. Your change will be applied to the Course Dashboard table, course tables, lesson tables and quiz tables.
To change either or both of these colors, enable the module and use the color picker in the module settings. You can also set a new color by entering its hex value.
Non-LearnDash tables are, of course, not affected by your settings here.