diff --git a/diagramme_uml.md b/diagramme_uml.md
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--- a/diagramme_uml.md
+++ b/diagramme_uml.md
@@ -1,6 +1,8 @@
 <!-- https://mermaid.live -->
 
 ```mermaid
+%%{init: {'theme': 'neutral'}}%%
+
 classDiagram
     %% Classes
     class Tache {
diff --git a/diagramme_uml.png b/diagramme_uml.png
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