Minor fixes.

src/scss/media-grid.scss

@@ -43,6 +43,10 @@
         var(--frigate-card-grid-column-size)
     )
   );
+
+  // When at item is selected, it may be enlarged -- it should render "in-front"
+  // of the other cameras that will then "move out of the way".
+  z-index: 2;
 }
 
 slot {