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-rw-r--r--pygments/lexers/css.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/pygments/lexers/css.py b/pygments/lexers/css.py
index 4d7cb46f..71f27dc5 100644
--- a/pygments/lexers/css.py
+++ b/pygments/lexers/css.py
@@ -249,7 +249,7 @@ class CssLexer(RegexLexer):
],
'function-start': [
(r'\s+', Whitespace),
- (r'[-]+([\w+]+[-]*)+', Name.Variable),
+ (r'[-]+([A-Za-z][\w+]*[-]*)+', Name.Variable),
include('urls'),
(words(_vendor_prefixes,), Keyword.Pseudo),
(words(_keyword_values, suffix=r'\b'), Keyword.Constant),