How to set a background image in Ionic 4

Question

How do you set a background image in Ionic 4? I've tried several ways to no avail.

I'm following this tutorial: https://javebratt.com/ionic-firebase-tutorial-auth/

I've also tried

--background: #fff url('../../assets/images/cover.jpg') no-repeat center center / cover; }

Any help would be greatly appreciated. I'm using Ionic 4

ion-content {
  .background{
        background-image: url('../../../assets/img/login-image.jpg');
        -webkit-background-size: cover;
        -moz-background-size: cover;
        background-size: cover;
  }
form {
  margin-bottom: 32px;
  button {
    margin-top: 20px !important;
  }
}

p {
  font-size: 0.8em;
  color: #d2d2d2;
}

ion-label {
  margin-left: 5px;
}

ion-input {
  padding: 5px;
}

.invalid {
  border-bottom: 1px solid #ff6153;
}

.error-message {
  min-height: 2.2rem;
  ion-label {
    margin: 2px 0;
  }
}
}

<ion-content class="background">
<form [formGroup]="loginForm">
  <ion-item>
    <ion-label position="stacked">Email</ion-label>
    <ion-input
      formControlName="email"
      type="email"
      placeholder="Your email address"
      [class.invalid]="!loginForm.controls['email'].valid &&
      loginForm.controls['email'].touched"
    >
    </ion-input>
  </ion-item>
  <ion-item
    class="error-message"
    *ngIf="!loginForm.controls['email'].valid &&
       loginForm.controls['email'].touched"
  >
    <ion-label>Please enter a valid email address.</ion-label>
  </ion-item>

  <ion-item>
    <ion-label position="stacked">Password</ion-label>
    <ion-input
      formControlName="password"
      type="password"
      placeholder="Your password"
      [class.invalid]="!loginForm.controls['password'].valid&& loginForm.controls['password'].touched"
    >
    </ion-input>
    </ion-item>
  <ion-item
    class="error-message"
    *ngIf="!loginForm.controls['password'].valid
      && loginForm.controls['password'].touched"
  >
    <ion-label>Your password needs more than 6 characters.</ion-label>
  </ion-item>

  <ion-button (click)="loginUser(loginForm)" expand="block" [disabled]="!loginForm.valid">
    Log In
  </ion-button>
</form>

<ion-button expand="block" fill="clear" routerLink="/signup">
  Create a new account
</ion-button>

<ion-button expand="block" fill="clear" routerLink="/reset-password">
  I forgot my password 🙁
</ion-button>
  <ion-footer no-shadow>
    <div>
      <button ion-button icon-left block>
              Login with Google
      </button>
    </div>
      <div>
      <button ion-button icon-left block>
        Login with Facebook
      </button>
    </div>
  </ion-footer>
</ion-content>

Answer 1

This worked

ion-content {
  --background: #fff url("../../../assets/img/login-image.jpg") no-repeat center center / cover;
}