consul/docs/consul-mermaid-theme.json

{
  "theme": "default",
  "themeCSS": ".node rect, .er.entityBox { fill: rgb(220, 71, 125); stroke-width: 1; stroke: black; } .node .label { color: white; }; .cluster rect { fill: #f0f0f0; stroke-width: 1px; stroke: #333}; .edgeLabel { background-color: #f0f0f0; }; .er.entityBox + .er.entityLabel { fill: white }; .er.attributeBoxEven, .er.attributeBoxOdd { fill: #fff; stroke: #777 }"
}