diff --git a/theme/ckeditor5-ui/components/toolbar/blocktoolbar.css b/theme/ckeditor5-ui/components/toolbar/blocktoolbar.css
new file mode 100644
index 0000000..66614fc
--- /dev/null
+++ b/theme/ckeditor5-ui/components/toolbar/blocktoolbar.css
@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.
+ * For licensing, see LICENSE.md.
+ */
+
+:root {
+	--ck-color-block-toolbar-button: var(--ck-color-text);
+	--ck-block-toolbar-button-size: var(--ck-font-size-normal);
+}
+
+.ck.ck-block-toolbar-button {
+	color: var(--ck-color-block-toolbar-button);
+	font-size: var(--ck-block-toolbar-size);
+}