message: fix: update build demo layout
diff: @@ -143,8 +143,10 @@ function demo(content, payload) {
  <head>
  <!-- content.head -->
  ${content.head || ""}
  - <!-- content.css -->
  + <style>
  + /* content.css */
  ${content.css || ""}
  + </style>
  </head>
  <body>
  <textarea style="display: none;" data-patternplate-vault="data-patternplate-vault">${data}</textarea>
  