<h2 mat-dialog-title class="text-xl font-semibold">Guthaben aufladen</h2>
<mat-dialog-content>
    <form [formGroup]="form">
        <div *ngIf="errorMsg">
            {{ errorMsg }}
        </div>
        <div class="mb-2">
            <label for="amount">Betrag</label>
            <input
                    type="number"
                    id="amount"
                    formControlName="amount"
                    class="w-full px-2 py-1 bg-white text-black"
            />
        </div>
    </form>
</mat-dialog-content>
<mat-dialog-actions>
    <button mat-flat-button (click)="closeDialog()">Abbrechen</button>
    <button mat-flat-button (click)="submit()">Einzahlen</button>
</mat-dialog-actions>