digraph G {
  rankdir = LR;
  subgraph cluster_0 {
    style=filled;
    color=lightblue;
    node [style=filled,fillcolor=white];
    {rank=same; Service1; Service2}
    {rank=same; Interface1; Interface2}
    Service1 -> Interface1;
    Service2 -> Interface2
    label = "Application";
  }
}