diff --git a/docker-compose.yml b/docker-compose.yml
index 89d7036..df516a5 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -103,7 +103,9 @@ services:
       context: ./frontend
       dockerfile: Dockerfile
       args:
-        VITE_API_BASE_URL: ${VITE_API_BASE_URL:-http://localhost/api}
+        # Don't set VITE_API_BASE_URL to use relative path /api (recommended)
+        # This allows the frontend to work with any domain/IP
+        VITE_API_BASE_URL: ${VITE_API_BASE_URL:-}
     container_name: cosmo_frontend
     restart: unless-stopped
     volumes:
diff --git a/frontend/Dockerfile b/frontend/Dockerfile
index f9df441..c010e4d 100644
--- a/frontend/Dockerfile
+++ b/frontend/Dockerfile
@@ -17,8 +17,9 @@ RUN npm install
 # Copy source code
 COPY . .
 
-# Build argument for API URL
-ARG VITE_API_BASE_URL=http://localhost/api
+# Build argument for API URL (optional)
+# If not set, frontend will use relative path /api (recommended for production)
+ARG VITE_API_BASE_URL
 ENV VITE_API_BASE_URL=$VITE_API_BASE_URL
 
 # Build the application (skip TypeScript check for faster builds)