# Three non-overlapping groups
group.dmz { background: #ffa070; }
group.outer { background: #f07070; }
( Internal Network
[ Workstation ]
) { background: #70b070; }
[ Workstation ] --> [ Inner Firewall ]
( DMZ
[ Inner Firewall ] -> [ Proxy ]
--> [ Outer Firewall ]
) { class: dmz; }
( Outer
[ Internet ]
) { class: outer }
[ Outer Firewall ] --> [ Internet ]
[ Proxy ] --> [ Database ]