The nginx documentation says:
Server names are defined using the server_name directive and determine which server block is used for a given request.
This means that in your case you should enter aridev-VirtualBox in your browser instead of localhost.
To get this working, you need to enter aridev-VirtualBox into the local hosts file and point it to the IP address of your VirtualBox PC.
It will look like this:
192.168.1.1 aridev-VirtualBox
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