How do you build muscle over your rib cage?

Question

I can see my ribs and it's weird.

Don't be annoying and tell me to gain weight, I'm not that skinny.

I just want to know some specific exercises.

Answer 1

I dont think there are any mussels there. You could try bulking up your chest and abs  it would proabaly bring more definition to that area.  

Answer 2

There are no major muscle groups covering the ribs