Merge pull request #4171 from TomJGooding/docs-events-add-tcss-to-on-…

…decorator-examples

docs(events): add tcss to on decorator examples

docs/guide/events.md

@@ -210,6 +210,12 @@ In the following example we have three buttons, each of which does something dif
 
     1. The message handler is called when any button is pressed
 
+=== "on_decorator.tcss"
+
+    ```python title="on_decorator.tcss"
+    --8<-- "docs/examples/events/on_decorator.tcss"
+    ```
+
 === "Output"
 
     ```{.textual path="docs/examples/events/on_decorator01.py"}
@@ -233,6 +239,12 @@ The following example uses the decorator approach to write individual message ha
     2. Matches the button with class names "toggle" *and* "dark"
     3. Matches the button with an id of "quit"
 
+=== "on_decorator.tcss"
+
+    ```python title="on_decorator.tcss"
+    --8<-- "docs/examples/events/on_decorator.tcss"
+    ```
+
 === "Output"
 
     ```{.textual path="docs/examples/events/on_decorator02.py"}