Below selector can style them. They'll probably be gone when I rewrite CB Connections. For now no further improvements outside bugs are being done to CB Connections as it needs to be rewritten.
Both:
#cbtabpaneaction .containerBox input[type="radio"]
Accept:
#cbtabpaneaction .containerBox input[type="radio"][value="a"]
Reject:
#cbtabpaneaction .containerBox input[type="radio"][value="d"]