Preview won't work properly.

[Alvin Yanson]

I have followed the steps in ngx gallery works fine but the preview won't work properly. I have also added in my styles.css this line
.mat-sidenav-container, .mat-sidenav-content, .mat-tab-body-content {
transform: none !important;
}
I cannot see the left icon, please let me know if this is already solved because I looked for Issues but still can't solve my problem. Thank you.