diff --git a/.prettierrc b/.prettierrc
index dcb7279..420ffc9 100644
--- a/.prettierrc
+++ b/.prettierrc
@@ -1,4 +1,5 @@
 {
+  "tabWidth": 4,
   "singleQuote": true,
   "trailingComma": "all"
 }
\ No newline at end of file
diff --git a/src/app.controller.spec.ts b/src/app.controller.spec.ts
index d22f389..2552ec5 100644
--- a/src/app.controller.spec.ts
+++ b/src/app.controller.spec.ts
@@ -3,20 +3,20 @@ import { AppController } from './app.controller';
 import { AppService } from './app.service';
 
 describe('AppController', () => {
-  let appController: AppController;
+    let appController: AppController;
 
-  beforeEach(async () => {
-    const app: TestingModule = await Test.createTestingModule({
-      controllers: [AppController],
-      providers: [AppService],
-    }).compile();
+    beforeEach(async () => {
+        const app: TestingModule = await Test.createTestingModule({
+            controllers: [AppController],
+            providers: [AppService],
+        }).compile();
 
-    appController = app.get<AppController>(AppController);
-  });
+        appController = app.get<AppController>(AppController);
+    });
 
-  describe('root', () => {
-    it('should return "Hello World!"', () => {
-      expect(appController.getHello()).toBe('Hello World!');
+    describe('root', () => {
+        it('should return "Hello World!"', () => {
+            expect(appController.getHello()).toBe('Hello World!');
+        });
     });
-  });
 });
diff --git a/src/app.controller.ts b/src/app.controller.ts
index cce879e..a325e8b 100644
--- a/src/app.controller.ts
+++ b/src/app.controller.ts
@@ -3,10 +3,10 @@ import { AppService } from './app.service';
 
 @Controller()
 export class AppController {
-  constructor(private readonly appService: AppService) {}
+    constructor(private readonly appService: AppService) {}
 
-  @Get()
-  getHello(): string {
-    return this.appService.getHello();
-  }
+    @Get()
+    getHello(): string {
+        return this.appService.getHello();
+    }
 }
diff --git a/src/app.module.ts b/src/app.module.ts
index 8662803..da156b4 100644
--- a/src/app.module.ts
+++ b/src/app.module.ts
@@ -3,8 +3,8 @@ import { AppController } from './app.controller';
 import { AppService } from './app.service';
 
 @Module({
-  imports: [],
-  controllers: [AppController],
-  providers: [AppService],
+    imports: [],
+    controllers: [AppController],
+    providers: [AppService],
 })
 export class AppModule {}
diff --git a/src/app.service.ts b/src/app.service.ts
index 927d7cc..61b7a5b 100644
--- a/src/app.service.ts
+++ b/src/app.service.ts
@@ -2,7 +2,7 @@ import { Injectable } from '@nestjs/common';
 
 @Injectable()
 export class AppService {
-  getHello(): string {
-    return 'Hello World!';
-  }
+    getHello(): string {
+        return 'Hello World!';
+    }
 }
diff --git a/src/main.ts b/src/main.ts
index 13cad38..827b631 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -2,7 +2,7 @@ import { NestFactory } from '@nestjs/core';
 import { AppModule } from './app.module';
 
 async function bootstrap() {
-  const app = await NestFactory.create(AppModule);
-  await app.listen(3000);
+    const app = await NestFactory.create(AppModule);
+    await app.listen(3000);
 }
 bootstrap();
diff --git a/test/app.e2e-spec.ts b/test/app.e2e-spec.ts
index 50cda62..ce86fb8 100644
--- a/test/app.e2e-spec.ts
+++ b/test/app.e2e-spec.ts
@@ -4,21 +4,21 @@ import * as request from 'supertest';
 import { AppModule } from './../src/app.module';
 
 describe('AppController (e2e)', () => {
-  let app: INestApplication;
+    let app: INestApplication;
 
-  beforeEach(async () => {
-    const moduleFixture: TestingModule = await Test.createTestingModule({
-      imports: [AppModule],
-    }).compile();
+    beforeEach(async () => {
+        const moduleFixture: TestingModule = await Test.createTestingModule({
+            imports: [AppModule],
+        }).compile();
 
-    app = moduleFixture.createNestApplication();
-    await app.init();
-  });
+        app = moduleFixture.createNestApplication();
+        await app.init();
+    });
 
-  it('/ (GET)', () => {
-    return request(app.getHttpServer())
-      .get('/')
-      .expect(200)
-      .expect('Hello World!');
-  });
+    it('/ (GET)', () => {
+        return request(app.getHttpServer())
+            .get('/')
+            .expect(200)
+            .expect('Hello World!');
+    });
 });