Can't make SSL certificate work

Can't make SSL certificate work. I bought a SSL sertificate from Comodo using NameCheap. I received two files on email in this format

 www_website_com.ca-bundle
 www_website_com.crt

I have put them in the same directory root where files server.key and server.csr were generated for purchase. After that I restarted Nginx and Gunicorn, but I don't see it work.