Threat JS:Decode -CID [TRJ]

I’m getting a threat alert which neither I or 1and1 can find. It’s disbaling a website i’m trying to work on.
How can I get rid of the alert?

Hello,
If it is your page and you know it is a false positive, report it via https://www.avast.com/false-positive-file-form.php
You can also add an exception to Web Shield, however that means that if it is not a false positive, you could be infected.
Kind regards,
Ondrej Kolacek