Styling a node
graph LR
id1(Start)-->id2(Stop)
style id1 fill:#f9f,stroke:#333,stroke-width:4px;
style id2 fill:#ccf,stroke:#f66,stroke-width:2px,stroke-dasharray: 5, 5;
classDef className fill:#f9f,stroke:#333,stroke-width:4px;
class nodeId1 className;