fix docker-compose

Author: callicoder

docker-compose.yml

@@ -1,6 +1,6 @@
 # Docker Compose file Reference (https://docs.docker.com/compose/compose-file/)
 
-version: '3.3'
+version: '3.7'
 
 # Define services
 services:
@@ -28,8 +28,8 @@ services:
     build:
       context: polling-app-client # Use an image built from the specified dockerfile in the `polling-app-client` directory.
       dockerfile: Dockerfile
-    args:
-      REACT_APP_API_BASE_URL: http://127.0.0.1:8080/api
+      args:
+        REACT_APP_API_BASE_URL: http://127.0.0.1:8080/api
     ports:
       - "9090:80" # Forward the exposed port 80 on the container to port 80 on the host machine
     restart: always