comment out ugly thumbnail bg for now

skins/base/css/molecules/MImageTile.css

@@ -15,9 +15,11 @@ limitations under the License.
 */
 
 .mx_MImageTile_thumbnail {
+/*
     background-color: #fff;
     border: 2px solid #fff;
     border-radius: 1px;
+*/
 }
 
 .mx_MImageTile_download {