digraph { node [shape=box, style=rounded]; rankdir=TB; subgraph clusterMain { "ESP_Commit" [label= tooltip="ESP_Commit" href="https://acdl.mit.edu/csi/job/ESP_Commit/"]; "ESP_Stanalizer" [label= tooltip="ESP_Stanalizer" href="https://acdl.mit.edu/csi/job/ESP_Stanalizer/"]; color=invis;} subgraph clusterStandalone { color=invis;} "ESP_Commit" -> "ESP_Stanalizer" [ color=black ] ; }