Custom invoice template

Hello every one.
how to make custom invoice format in Manager,
mean i can make changes in code please give code of HTML, CSS

Settings - Obsolete Features - Themes

Please note the following:

  1. Obsolete features mean they are no longer supported by the Developer.
  2. Manager obsolete themes function uses LIquid code rather than HTML+CSS
  3. The Forum rules at FAQ - Manager Forum state:

If your question is related to custom themes or custom reports, always post the code or report definition you have developed and the results it produces. Do not simply post a picture of something you want and ask other users to tell you how to achieve it.