Basic WebSocket implementaion

Downgrade to Socket.io 2.3.0

src/app/pay/pay.component.css

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+.bg {
+    position: fixed;
+    top: 0;
+    left: 0;
+    width: 100vw;
+    height: 100vh;
+    background-color: #F7A12F;
+    z-index: -999;
+}
+
+.content {
+    margin: 0 auto;
+    transform: translateY(20vh);
+    transform-origin: center;
+    min-width: 900px;
+    width: 50vw;
+    
+    /* Shadow */
+    box-shadow:
+        0 -0.5px 2.8px -9px rgba(0, 0, 0, 0.39)
+    ;
+}
+
+.content * {
+    width: 100%;
+}

src/app/pay/pay.component.html

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+<div class="bg"></div>
+<div class="content">
+    <app-header></app-header>
+    <app-payment></app-payment>
+</div>

src/app/pay/pay.component.spec.ts

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+import { ComponentFixture, TestBed } from '@angular/core/testing';
+
+import { PayComponent } from './pay.component';
+
+describe('PayComponent', () => {
+  let component: PayComponent;
+  let fixture: ComponentFixture<PayComponent>;
+
+  beforeEach(async () => {
+    await TestBed.configureTestingModule({
+      declarations: [ PayComponent ]
+    })
+    .compileComponents();
+  });
+
+  beforeEach(() => {
+    fixture = TestBed.createComponent(PayComponent);
+    component = fixture.componentInstance;
+    fixture.detectChanges();
+  });
+
+  it('should create', () => {
+    expect(component).toBeTruthy();
+  });
+});

src/app/pay/pay.component.ts

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+import { Component, OnInit } from '@angular/core';
+
+@Component({
+  selector: 'app-pay',
+  templateUrl: './pay.component.html',
+  styleUrls: ['./pay.component.css']
+})
+export class PayComponent implements OnInit {
+
+  constructor() { }
+
+  ngOnInit(): void {
+  }
+
+}