Unable to access assets (images/css) from Dev docker

I have followed the instruction on going to dev folder and running the docker up command but the css and javascripts are not loaded when visiting the localhost site. I get 404 on 
```
http://localhost/assets/built/casper.js?v=758112830a
http://localhost/assets/built/screen.css?v=758112830a
```
I believe it to be some problem with Nginx configuration issue. 