Ionic 4 slides full image

So i’m using slides on my project and getting images from JSON, the problem is i can’t put the pictures on the full slide, i even tried to change height but i couldn’t.

<ion-slides   #mySlider pager="true"  [options]="slideOpts">

        <ion-slide *ngFor="let post of posts" (click)="openPost(post.id)">

                <ion-img [src]="post.media.getThumbnail('full')"></ion-img>

       </ion-slide>

</ion-slides>