fix media gallery min height

mastodon/mastodon4.user.css

@@ -1,7 +1,7 @@
 /* ==UserStyle==
 @name           mastodon 4 ui tweaks
 @namespace      mastodon4
-@version        1.0.6
+@version        1.0.7
 @description    fixes the weird spacing on the new mastodon web ui. intended for the advanced user interface, may also work with the single column one.
 @author         xenua
 @license        CNPLv7+
@@ -170,6 +170,7 @@
         flex-flow: column nowrap;
         aspect-ratio: unset !important;
         margin-top: 4px !important;
+        min-height: 0;
     }
     .notification .media-gallery > .spoiler-button {
         display: none;