digraph g {
    goal[label="My goal", peripheries=2]

    n1[label="Some task"]
    n2[label="Some other task"]
    n3[label="Split classes"]

    subgraph done {
        node[fillcolor="#ccffcc", style=filled]

        n4[label="Add property"]
        n5[label="Something again"]
    }

    goal -> n1
    goal -> n2
    n1 -> n3
    n1 -> n4
    n1 -> n5
}