login.html

<ion-header>
  <ion-navbar>
    <ion-title>Demo</ion-title>
  </ion-navbar>
</ion-header>

<ion-content padding>

  <img class="logo" src="assets/imgs/logo.png" alt="Ionic Framework logo">

    <div class="login">
      <h1>Welcome</h1>
      <p>Please log in to access the Demo.</p>
      <form [formGroup]="form" (ngSubmit)="logIn()">
        <ion-list>

          <ion-item margin-bottom>
            <ion-label>Your E-mail Address</ion-label>
            <ion-input type="email" formControlName="email"></ion-input>
          </ion-item>

          <ion-item margin-bottom>
            <ion-label>Your Password</ion-label>
            <ion-input type="password" formControlName="password"></ion-input>
          </ion-item>

          <button ion-button color="primary" text-center block [disabled]="!form.valid">Log In</button>
        </ion-list>
      </form>
    </div>

</ion-content>