diff --git a/.editorconfig b/.editorconfig
index 639d9791..e385fb3c 100644
--- a/.editorconfig
+++ b/.editorconfig
@@ -6,7 +6,7 @@ charset = utf-8
 end_of_line = lf
 insert_final_newline = true
 
-[*.py]
+[*.{py,css}]
 indent_style = tab
 # I do not think we prescribe, how big a tab is.
 indent_size = unset