diff --git a/docs/index.md b/docs/index.md
index 17ac22c5f..81fbfcbb0 100644
--- a/docs/index.md
+++ b/docs/index.md
@@ -10,19 +10,19 @@ Creating a TUI can be challenging. It may be easier to create a GUI or web appli
 
 Textual seeks to lower the difficulty level of building a TUI by borrowing developments from the web world and to a lesser extent desktop applications. The goal is for it to be as easy to develop a TUI for your project as it would be to add a command line interface.XX
 
-=== "Python"
+=== "simple.py"
 
     ```python
     --8<-- "docs/examples/simple.py"
     ```
 
-=== "CSS"
+=== "simple.css"
 
-    ```python
+    ```scss
     --8<-- "docs/examples/simple.css"
     ```
 
-=== "Terminal"
+=== "Result"
 
     ```{.textual path="docs/examples/simple.py" columns="80" lines="24"}
     ```
diff --git a/poetry.lock b/poetry.lock
index d0a40e58a..f69a66ef7 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -650,7 +650,7 @@ pyyaml = "*"
 
 [[package]]
 name = "rich"
-version = "12.4.3"
+version = "12.4.4"
 description = "Render rich text, tables, progress bars, syntax highlighting, markdown and more to the terminal"
 category = "main"
 optional = false
@@ -1360,8 +1360,8 @@ pyyaml-env-tag = [
     {file = "pyyaml_env_tag-0.1.tar.gz", hash = "sha256:70092675bda14fdec33b31ba77e7543de9ddc88f2e5b99160396572d11525bdb"},
 ]
 rich = [
-    {file = "rich-12.4.3-py3-none-any.whl", hash = "sha256:26ef784599a9ab905ade34ff28904e4fbe9bce16e02c33c78b0229551104c146"},
-    {file = "rich-12.4.3.tar.gz", hash = "sha256:e7550ca19aec51b216ae4c34bfce82e94a0c79bdbf95cafbf42f343d0fb3f45a"},
+    {file = "rich-12.4.4-py3-none-any.whl", hash = "sha256:d2bbd99c320a2532ac71ff6a3164867884357da3e3301f0240090c5d2fdac7ec"},
+    {file = "rich-12.4.4.tar.gz", hash = "sha256:4c586de507202505346f3e32d1363eb9ed6932f0c2f63184dea88983ff4971e2"},
 ]
 six = [
     {file = "six-1.16.0-py2.py3-none-any.whl", hash = "sha256:8abb2f1d86890a2dfb989f9a77cfcfd3e47c2a354b01111771326f8aa26e0254"},
diff --git a/src/textual/app.py b/src/textual/app.py
index 31d91b8dc..20f448258 100644
--- a/src/textual/app.py
+++ b/src/textual/app.py
@@ -763,6 +763,11 @@ class App(Generic[ReturnType], DOMNode):
                 self._log_console = None
 
     async def _ready(self) -> None:
+        """Called immediately prior to processing messages.
+
+        May be used as a hook for any operations that should run first.
+
+        """
         try:
             screenshot_timer = float(os.environ.get("TEXTUAL_SCREENSHOT", "0"))
         except ValueError:
@@ -772,8 +777,9 @@ class App(Generic[ReturnType], DOMNode):
             return
 
         async def on_screenshot():
+            """Used by docs plugin."""
             svg = self.export_screenshot()
-            self._screenshot = svg
+            self._screenshot = svg  # type: ignore
             await self.shutdown()
 
         self.set_timer(screenshot_timer, on_screenshot)
@@ -880,7 +886,7 @@ class App(Generic[ReturnType], DOMNode):
         Args:
             renderable (RenderableType): A Rich renderable.
         """
-        if self._running and not self._closed:
+        if self._running and not self._closed and not self.is_headless:
             console = self.console
             if self._sync_available:
                 console.file.write("\x1bP=1s\x1b\\")
diff --git a/src/textual/widget.py b/src/textual/widget.py
index 11d17666c..d3bdb491c 100644
--- a/src/textual/widget.py
+++ b/src/textual/widget.py
@@ -399,6 +399,8 @@ class Widget(DOMNode):
         scrolled_x = scrolled_y = False
         if animate:
             # TODO: configure animation speed
+            if duration is None and speed is None:
+                speed = 50
             if x is not None:
                 self.scroll_target_x = x
                 if x != self.scroll_x: