How to auto resize height of slide in ionic

Ionic Framework ionic-v3
1

I’m using Card and Slide in ionic, content of slide include a lot of slide with: content text or video. When I display first slide it displayed normal with just video, but when I move to second slide with a text content, it appear while space as below photo:

Untitled
Untitled.png346×653 10 KB

my HTML:

<ion-card>        
    <ion-list>          
        <ion-row>
            <ion-col class="title_text">> Question Sheet</ion-col>
        </ion-row>          
        <ion-slides>             
            <ion-slide *ngFor="let content of item_exam; let i = index;">
                <div class="row_ans">
					<ion-row>
                        <ion-label>{{content.page}}. <div class="mark_answer" [innerHTML]= "content.question"></div></ion-label>                              
                    </ion-row>
                    <ion-row>
						<ion-label><div class="score_ans">{{content.allotting}} scores </div></ion-label>
                    </ion-row>                        
                </div>                  
              <ion-row>
                  <ion-col> 
                      <button (click)="prev_button()" color="danger" ion-button text-only [disabled]="i === 0">Previous</button>
                  </ion-col>
                  <ion-col>
                      <button [disabled]="!item_exam" *ngIf="i<item_exam.length - 1" ion-button text-only color="danger" (click)="next_button()">Next</button>
                  </ion-col>
              </ion-row>
            </ion-slide> 
        </ion-slides> 
	</ion-list>
</ion-card>

My scss

.ion-card_resize {
    // height: 50% !important;
     display:block;
     height: auto !important;
    
    // margin-top: 0;
    // margin-bottom:0;
    // padding-top:0;
}
ion-slides {
    height: auto !important;
}
ion-card {
    height: auto !important;
}
.row_ans {
    float:left;        
    margin-right:130px;
    font-size: 11pt;
    width: 100%;
}
.score_ans {
    margin-right: 160px;
    font-size: 10pt;
}

How to auto resize this slide, card or remove blank space as photo ?