add: button.

app.py

@@ -76,6 +76,22 @@ with block:
                         rounded=(True, False, False, True),
                         container=False,
                     )
+            negative = gr.Textbox(
+                        label="Enter your negative prompt",
+                        show_label=False,
+                        max_lines=1,
+                        placeholder="Enter a negative prompt",
+                        elem_id="negative-prompt-text-input",
+                    ).style(
+                        border=(True, False, True, True),
+                        rounded=(True, False, False, True),
+                        container=False,
+                    )
+          btn = gr.Button("Generate image").style(
+              margin=False,
+              rounded=(False, True, True, False),
+              full_width=False,
+          )
       gr.HTML(
         """
           <div class="acknowledgments">