Briggs Softworks

Hello! I had an idea to make a good, adaptive image background. I found the html head section and wanted to paste the css code there with image path.
If i create html file and test them all is work. But when i add code to admin panel PM it's not work.

Please help me.
How i can use background image for adaptive position?

If I understand your question, you are trying to override default settings with custom css. If so, that's not a good idea.