feat: export opacity utils

tailwind.config.js

@@ -30,6 +30,7 @@ module.exports = {
         /^((sm|md|lg|xl)\:)?grid-flow-*/,
         /^((sm|md|lg|xl)\:)?head-*/,
         /^((sm|md|lg|xl)\:)?clearfix/,
+        /opacity-*/,
         /^text-*/,
         /^max-w-*/,
         /ico--*/,