dune

(subdir
 asset/
 (rule
  (target main.css)
  (mode fallback)
  (deps
   %{workspace_root}/tailwind.config.js
   %{workspace_root}/template/styles.css
   (glob_files %{workspace_root}/template/*.eml))
  (action
   (chdir
    %{workspace_root}
    (run
     tailwindcss
     build
     -c
     tailwind.config.js
     -i
     template/styles.css
     -o
     %{target})))))