diff --git a/daidokoro/Dockerfile b/daidokoro/Dockerfile
index 47df611..3075fd8 100644
--- a/daidokoro/Dockerfile
+++ b/daidokoro/Dockerfile
@@ -8,4 +8,6 @@ RUN npm install -g @angular/cli
 
 RUN npm install
 
-ENTRYPOINT ["ng", "serve", "--host", "0.0.0.0","--port","80"]
+EXPOSE 4200
+
+ENTRYPOINT ["ng", "serve", "--open", "--host", "0.0.0.0"]