Update app.py

app.py

@@ -48,15 +48,16 @@ with gr.Blocks() as demo2:
         
         gr.Markdown("*****")
 
-        df = gr.Dataframe(
-            headers=["start index", "end index", "label"],
-            datatype=["number", "number", "number"],
-            row_count=0,
-            col_count=(3, "fixed"),
-        )
-        def make_dataset(df):
-            return df.fillna(-1)
-        df2 = gr.Dataframe()
+        with gr.Row():
+            df = gr.Dataframe(
+                headers=["start_index", "end_index", "label"],
+                datatype=["number", "number", "number"],
+                row_count=0,
+                col_count=(3, "fixed"),
+            )
+            def make_dataset(df):
+                return df.fillna(-1)
+            df2 = gr.Dataframe()
         btn_add_segm = gr.Button(value="create dataset")
         btn.click(make_dataset, inputs=df, outputs=df2)