diff --git a/.headroom-templates/css.mustache b/.headroom-templates/css.mustache
new file mode 100644
index 0000000..ca3ddff
--- /dev/null
+++ b/.headroom-templates/css.mustache
@@ -0,0 +1,18 @@
+/*
+ * {{ project }}
+ * Copyright (c) {{ year }} {{ author }}
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public
+ * License along with this program.
+ * If not, see http://www.gnu.org/licenses/.
+ */