diff --git a/00-Lesson-Site/docker-compose.yaml b/00-Lesson-Site/docker-compose.yaml
index 73deeef..9161cb8 100644
--- a/00-Lesson-Site/docker-compose.yaml
+++ b/00-Lesson-Site/docker-compose.yaml
@@ -5,22 +5,18 @@ services:
             context: ./frontend
             target: development
         ports:
-            - ${SERVER_FRONTEND_DEV_PORT}:4321
+            - ${SERVER_FRONTEND_DEV_PORT:?error}:4321
         volumes:
             - ./frontend:/app
             - /app/node_modules
         profiles:
             - dev
-        env_file:
-            - ../.env
     leafpig-lesson-site-frontend-prod:
         container_name: leafpig-lesson-site-frontend-prod
         build:
             context: ./frontend
             target: production
         ports:
-            - ${SERVER_FRONTEND_PORT}:5000
+            - ${SERVER_FRONTEND_PORT:?error}:5000
         profiles:
             - prod
-        env_file:
-            - ../.env