Docker on Ubuntu Server noob

I'm trying to learn Docker on Azure. I'm using a book called Microservices with Docker on Microsoft Azure. I seem to be stuck on Chapter 2 where we create a simple index.html page in the /host/src folder.

When I execute

docker run --name webcontainer -v /home/src:/usr/share/nginx/html:ro -p 80:80 -d nginx

then execute

curl http://localhost

it keeps going to the default index.html instead of the index.html in my /home/src dir. Am I missing something here?