graph UML {
  nodesep=0.3;
  color="black"
  bgcolor="white"
  node [fontsize=10];

    // class Employee 
    Employee [fillcolor="#ffcc19", shape="record", style="filled", label="Employee"];
      Employee -- Person [arrowhead=empty];

    // class Person 
    Person [fillcolor="#ffcc19", shape="record", style="filled", label="Person"];

    // class Client 
    Client [fillcolor="#ffcc19", shape="record", style="filled", label="Client"];
      Client -- Person [arrowhead=empty];


}
