A family of Microsoft relational database management systems designed for ease of use.
Just to clear up some terminology, so everyone is on the same page in Access we don't really have rows, columns, intersections...
Row -> Record
Column -> Field
It would go a long way if you gave us a concrete example or 2 to develop code for because there are a multitude of way to do this. Might I also ask why you don't just use the Conditional Formatting wizard in the form directly?
Have you seen https://blogs.msdn.microsoft.com/frice/2004/06/08/adding-additional-conditional-formatting-in-access-with-vba/ ?