fix rich export size

docs/api/index.md

@@ -1,5 +1,5 @@
 # API
 
-This is a API-level reference to the Textual API. See the links on the left (or in the burger menu) for each module, where you can drill down to a class or method.
+This is a API-level reference to the Textual API. Click the links to your left (or in the burger menu) to open a reference for each module.
 
 If you are new to Textual, you may want to read the [tutorial](./../tutorial.md) or [guide](../guide/index.md) first.

src/textual/_doc.py

@@ -125,11 +125,16 @@ def rich(source, language, css_class, options, md, attrs, **kwargs) -> str:
 
     title = attrs.get("title", "Rich")
 
+    rows = int(attrs.get("lines", 24))
+    columns = int(attrs.get("columns", 80))
+
     console = Console(
         file=io.StringIO(),
         record=True,
         force_terminal=True,
         color_system="truecolor",
+        width=columns,
+        height=rows,
     )
     error_console = Console(stderr=True)
 

src/textual/color.py

@@ -8,7 +8,7 @@ You can convert from a Textual color to a Rich color with the [rich_color][textu
 
 The following named colors are used by the [parse][textual.color.Color.parse] method.
 
-```{.rich title="colors"}
+```{.rich columns="80" title="colors"}
 from textual._color_constants import COLOR_NAME_TO_RGB
 from textual.color import Color
 from rich.table import Table