nginx – In which directory should I put the files from my site accessible via the Web server running in a Docker container?

I've created a Docker container with docker-compose help
The file docker-compose.yml is in the repertoire / home // DockerFolder.
The file is configured as follows:

####
# ATENTION:
# Replace all instances of sandbox with the name of your project
####

# v2 syntax
version: & # 39; 2 & # 39;

# Named volumes
volumes:

# MySQL data
sandbox-mysql-data:
driver: local

services:
# MySQL (5.7)
mysql:
image: mysql: 5.7
Container name: sandbox-mysql
volumes:
- sandbox-mysql-data: / var / lib / mysql
ports:
- "3306: 3306"
environment:
- MYSQL_ROOT_PASSWORD = sandbox
- MYSQL_DATABASE = sandbox
- MYSQL_USER = sandbox
- MYSQL_PASSWORD = sandbox

# PHP (with Nginx)
# you can go from nginx to apache, just change the session 'image'
app:
image: ambientum / php: 7.2-nginx
container_name: sandbox-app
volumes:
/ var / www / app
ports:
- "80: 8080"
connections:
- mysql

Waiting Files #Laravel
stand in line
image: ambientum / php: 7.2
container name: sandbox queue
command: php craft queue: listen
volumes:
/ var / www / app
connections:
- mysql

I created the index.php file in the same directory to test the server, but no information was returned. Is the file in the right place? How can I see it in my browser?