diff --git a/superset/assets/images/viz_thumbnails/country_map.png b/superset/assets/images/viz_thumbnails/country_map.png index 3ac6c0985c0..896fd6b09a9 100644 Binary files a/superset/assets/images/viz_thumbnails/country_map.png and b/superset/assets/images/viz_thumbnails/country_map.png differ diff --git a/superset/assets/images/viz_thumbnails/horizon.png b/superset/assets/images/viz_thumbnails/horizon.png index 7ccd90f3ff2..a5d4bf3ec43 100644 Binary files a/superset/assets/images/viz_thumbnails/horizon.png and b/superset/assets/images/viz_thumbnails/horizon.png differ