Leaderboard: small inline avatar via injected CSS (Gradio 6 strips img sizing)

app.py

@@ -145,7 +145,24 @@ def _on_run(preset_label: str, custom: str):
     )
 
 
+# Gradio's Dataframe markdown strips <img> sizing attributes, so force a small,
+# inline avatar next to the trainer name via CSS.
+_CSS = """
+#leaderboard-table img {
+  width: 20px !important;
+  height: 20px !important;
+  min-width: 20px !important;
+  border-radius: 50%;
+  display: inline-block;
+  vertical-align: middle;
+  margin: 0 4px 0 0 !important;
+}
+"""
+
 with gr.Blocks(title="armnet demo — evaluate a policy on real robots") as demo:
+    # Inject CSS via a <style> element (Gradio 6 moved the Blocks `css=` arg to
+    # launch(), which the Space controls, so this is the portable way).
+    gr.HTML(f"<style>{_CSS}</style>")
     gr.Markdown(
         "# armnet demo — evaluate a policy on real robots\n"
         "Pick or paste a policy, press **Run**, and watch **"
@@ -207,6 +224,7 @@ with gr.Blocks(title="armnet demo — evaluate a policy on real robots") as demo
                 interactive=False,
                 wrap=True,
                 label="Leaderboard",
+                elem_id="leaderboard-table",
             )
 
     # Timers drive every session from the shared state (this keeps the demo

leaderboard.py

@@ -159,12 +159,9 @@ class Leaderboard:
 
     def _row(self, e: Entry) -> list:
         avatar = self._avatar_url(e.username)
-        pfp = (
-            f'<img src="{avatar}" width="20" height="20" '
-            f'style="border-radius:50%;vertical-align:middle;margin-right:4px">'
-            if avatar
-            else ""
-        )
+        # Sizing/style is enforced via CSS (#leaderboard-table img) because
+        # Gradio's Dataframe markdown strips width/height/style off <img>.
+        pfp = f'<img src="{avatar}"> ' if avatar else ""
         trainer = f"{pfp}[{e.username}](https://huggingface.co/{e.username})"
         policy = f"[{e.repo_id}](https://huggingface.co/{e.repo_id})"
         if e.revision and e.revision != "unknown":