message: Remove margins when in a ReplyThread to stop them taking so much space
diff: @@ -14,8 +14,13 @@ See the License for the specific language governing permissions and
  limitations under the License.
  */
  +.mx_ReplyThread {
  + margin-top: 0;
  +}
  +
  .mx_ReplyThread .mx_DateSeparator {
  font-size: 1em !important;
  + margin-top: 0;
  margin-bottom: 0;
  padding-bottom: 1px;
  bottom: -5px;
  