Don't know if this question is appropriate here.
I created an Alias directed to the root folder of the website (right now running on localhost). In the root folder, I have a custom 404 page, and I've added a .htaccess file in that folder with the "ErrorDocument 404 /404.html" line, but it still doesn't work.
I'm pretty new to this stuff (web servers), so I must be missing something obvious. Any suggestions greatly appreciated.