diff --git a/svg_iternal.h b/svg_iternal.h
new file mode 100644
index 0000000..793e9cf
--- /dev/null
+++ b/svg_iternal.h
@@ -0,0 +1,5 @@
+#pragma once
+#include <iostream>
+#include <string>
+
+std::string check_color(const std::string& color);
\ No newline at end of file