Index: wp-includes/css/media-views.css
===================================================================
--- wp-includes/css/media-views.css	(revision 22946)
+++ wp-includes/css/media-views.css	(working copy)
@@ -1443,4 +1443,16 @@
 		width: 600px;
 		position: absolute;
 	}
+
+	.media-selection {
+		width: 120px;
+	}
+
+	.media-selection::after {
+		background: none;
+	}
+
+	.media-selection .attachments {
+		display: none;
+	}
 }