fix for footer

sandbox/will/footer.py

@@ -0,0 +1,13 @@
+from textual.app import App
+from textual.widgets import Footer
+
+
+class FooterApp(App):
+    def on_mount(self):
+        self.dark = True
+        self.bind("b", "app.bell", description="Play the Bell")
+        self.bind("f1", "app.bell", description="Hello World")
+        self.bind("f2", "app.bell", description="Do something")
+
+    def compose(self):
+        yield Footer()