Index: src/wp-admin/css/themes.css
===================================================================
--- src/wp-admin/css/themes.css	(revision 47748)
+++ src/wp-admin/css/themes.css	(working copy)
@@ -1104,6 +1104,13 @@
 	}
 }
 
+@media only screen and (max-width: 782px) {
+	.upload-theme .wp-upload-form,
+	.upload-plugin .wp-upload-form {
+		display: block;
+	}
+}
+
 .theme-details .theme-rating {
 	line-height: 1.9;
 }