Xenforo 2.1 Postbit background not showing

[redwineiii]

Dear members,

I made some changes on my postbit and added postbit background but the background is not showing, can't find the problem the code is correct.
Is it possible that it can happen because a server error ?
Copied full code extra.less and message_macros of a friends forum and on his forum it works fine, on mine forum it won't show up.
i used this tutorial : https://enxf.net/resources/postbit-background-custom-fields.1843/

Sorry for my english, Still learning it

 

[Verss]

screenshot the code and the id of the custom fields