graph LR
  linkStyle default fill:#ffffff

  subgraph diagram ["Software System - System Context"]
    style diagram fill:#ffffff,stroke:#ffffff

    1["<div style='font-weight: bold'>User</div><div style='font-size: 70%; margin-top: 0px'>[Person]</div>"]
    style 1 fill:#dddddd,stroke:#9a9a9a,color:#000000
    2["<div style='font-weight: bold'>Software System</div><div style='font-size: 70%; margin-top: 0px'>[Software System]</div>"]
    style 2 fill:#dddddd,stroke:#9a9a9a,color:#000000

    1-. "<div>Uses</div><div style='font-size: 70%'></div>" .->2
  end