src/app/views/login/login.html

<div class="login-container">
  <div class="login-form">
    <h2>Login to {{brandName}}</h2>
    <form (ngSubmit)="onSubmit(loginForm.value)" #loginForm="ngForm">
      <input type="email" [(ngModel)]="auth.username" name="username" required/>
      <input type="password" [(ngModel)]="auth.password" name="password" required/>
      <button type="submit" [disabled]="!loginForm.form.valid">Login</button>
    </form>
  </div>
</div>