diff --git a/theme.css b/theme.css
index 1cc7c1c..f9b58c8 100644
--- a/theme.css
+++ b/theme.css
@@ -89,6 +89,7 @@ kbd {
 #form #submit,
 #form #upload,
 #chat button.menu,
+#chat button.mentions,
 #viewport .lt,
 #viewport .rt {
 	color: var(--body-color-muted);