Fixes #14990: Media bodies take up full width

Signed-off-by: Beatrice Peng <bpeng@pivotal.io>

less/media.less

@@ -13,6 +13,10 @@
   overflow: hidden;
 }
 
+.media-body {
+  width: 10000px;
+}
+
 .media-object {
   display: block;
 }