diff --git a/core/modules/media_library/css/media_library.theme.css b/core/modules/media_library/css/media_library.theme.css
index 67517df202..c7055682ec 100644
--- a/core/modules/media_library/css/media_library.theme.css
+++ b/core/modules/media_library/css/media_library.theme.css
@@ -96,11 +96,20 @@
   margin: 8px 0 0;
 }
 
+/* Media add form selection styles. */
 .media-library-add-form-selection {
   margin-top: 1em;
   border-top: 1px solid #c0c0c0;
 }
 
+.media-library-add-form-selection .media-library-item {
+  width: 120px;
+}
+
+.media-library-add-form-selection .media-library-item .field--name-thumbnail img {
+  height: 100px;
+}
+
 .media-library-views-form__header .form-item {
   margin-right: 8px;
 }