Do not purge head-* classes

tailwind.config.js

@@ -24,6 +24,7 @@ module.exports = {
         /^((sm|md|lg|xl)\:)?col-span-*/,
         /^((sm|md|lg|xl)\:)?row-span-*/,
         /^((sm|md|lg|xl)\:)?grid-flow-*/, // grid flow
+        /^((sm|md|lg|xl)\:)?head-*/,
         /^text-*/,
         /^max-w-*/, // maximum width
         /ico--*/, // icons