From 65821e7a3a08473efd3fa3fe5436acc4a34e9ca3 Mon Sep 17 00:00:00 2001
From: Will McGugan <willmcgugan@gmail.com>
Date: Wed, 9 Feb 2022 16:22:21 +0000
Subject: [PATCH] Update src/textual/css/styles.py

Co-authored-by: Darren Burns <darrenburns@users.noreply.github.com>
---
 src/textual/css/styles.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/textual/css/styles.py b/src/textual/css/styles.py
index 32781d54a..f10473c52 100644
--- a/src/textual/css/styles.py
+++ b/src/textual/css/styles.py
@@ -45,7 +45,7 @@ if TYPE_CHECKING:
     from ..layout import Layout
 
 
-class RulesMap(TypedDict):
+class RulesMap(TypedDict, total=False):
     """A typed dict for CSS rules.
 
     Any key may be absent, indiciating that rule has not been set.