paperless-ngx/src-ui/src/app/components/document-list/document-card-small/document-card-small.component.scss

.doc-img {
  object-fit: cover;
  object-position: top;
  height: 200px;
}

.document-card-check {
  display: none
}

.document-card:hover .document-card-check {
  display: block;
}