diff --git a/json_to_md.py b/json_to_md.py
index 8b210299..55bcafc9 100644
--- a/json_to_md.py
+++ b/json_to_md.py
@@ -61,15 +61,14 @@ def normalize_nodeid(nodeid):
     return None
 
 def get_details_block(summary, body, level=0, params_str=None):
-    margin = 18 * level
-    border = f"border-left: 2px solid #eee;" if level > 0 else ""
+    prefix = "  " * level  # indentation pour lisibilité manuelle
     if params_str:
-        summary = f"{summary} <span style='color: #888; font-size: 0.9em;'>parameters: [{params_str}]</span>"
-    return (f'<div style="margin-left: {margin}px; {border} padding-left: 8px;">\n'
-            f"<details>\n<summary>{summary}</summary>\n\n"
+        summary += f" | parameters: [{params_str}]"
+
+    return (f"{prefix}<details>\n"
+            f"{prefix}<summary>{summary}</summary>\n\n"
             f"{body}\n"
-            f"</details>\n"
-            f"</div>\n\n")
+            f"{prefix}</details>\n\n")
 
 
 def make_test_block(test, status, emoji, level, runtime_params):