Ember: Application.hbs not generating in body while building

I have a problem with ember-cli build option. While running server by ember s it's showing normal page with content, styles etc. But now I want to build this app and put it on my website by ftp so i tried ember build which build my project into /disk folder but the index.html file doesn't contain the stuff from application.hbs + no styles from styles/app.css.
I'm new to ember. What am I doing wrong? Docs of ember are saying nothing about this.