diff --git a/README.md b/README.md
index e3c1051..8adad5f 100644
--- a/README.md
+++ b/README.md
@@ -75,11 +75,11 @@ technology A or technology B to achieve element C:
 
 ```mermaid
 flowchart BT
-    classDef eoi fill:#fff, stroke:#000;
+    classDef eoi fill:#fff, stroke:#000, color:#000;
     classDef dependant fill:#fff, stroke:#888, color:#888;
-    classDef dep_missing fill:#fcc, stroke:#800;
-    classDef dep_assigned fill:#ffa, stroke:#a50;
-    classDef dep_completed fill:#afa, stroke:#080;
+    classDef dep_missing fill:#fcc, stroke:#800, color:#000;
+    classDef dep_assigned fill:#ffa, stroke:#a50, color:#000;
+    classDef dep_completed fill:#afa, stroke:#080, color:#000;
     0:::dep_missing
     0["#1 | MISSING\n<i>Process</i>\n<b>Technology A</b>"]
     1:::dep_completed
@@ -105,11 +105,11 @@ modelled as an intermediate _Process_ element in-between:
 
 ```mermaid
 flowchart BT
-    classDef eoi fill:#fff, stroke:#000;
+    classDef eoi fill:#fff, stroke:#000, color:#000;
     classDef dependant fill:#fff, stroke:#888, color:#888;
-    classDef dep_missing fill:#fcc, stroke:#800;
-    classDef dep_assigned fill:#ffa, stroke:#a50;
-    classDef dep_completed fill:#afa, stroke:#080;
+    classDef dep_missing fill:#fcc, stroke:#800, color:#000;
+    classDef dep_assigned fill:#ffa, stroke:#a50, color:#000;
+    classDef dep_completed fill:#afa, stroke:#080, color:#000;
     0:::dep_missing
     0["#2 | MISSING\n<i>Process</i>\n<b>Processing X using machine A</b>"]
     1:::dep_completed