diff --git a/json_to_md.py b/json_to_md.py
index 8d993b7e6..1766a53f0 100644
--- a/json_to_md.py
+++ b/json_to_md.py
@@ -36,16 +36,23 @@ def extract_param_str_from_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 ""
-    # Affiche les paramètres dans le résumé si présent
+    """
+    Génère un bloc <details> avec indentation simulée via des > en Markdown.
+    """
+    indent = "> " * level
     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"
-            f"{body}\n"
-            f"</details>\n"
-            f"</div>\n\n")
+        summary += f" <span style='color: #888; font-size: 0.9em;'>parameters: [{params_str}]</span>"
+
+    # Chaque ligne du body est indentée manuellement
+    body_indented = "\n".join(f"{indent}> {line}" if line.strip() else indent for line in body.strip().splitlines())
+
+    return (
+        f"{indent}<details>\n"
+        f"{indent}<summary>{summary}</summary>\n\n"
+        f"{body_indented}\n"
+        f"{indent}</details>\n\n"
+    )
+
 
 def make_test_block(test, status, emoji, level):
     nodeid = test.get("nodeid", "")