make aux panel behave vaguely intelligently

skins/base/css/molecules/RoomSettings.css

@@ -14,6 +14,10 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+.mx_RoomSettings {
+    max-height: 250px;
+}
+
 .mx_RoomSettings_settings {
     display: table;
     margin: 5px 0;

skins/base/css/organisms/RoomView.css

@@ -50,6 +50,10 @@ limitations under the License.
     max-width: 720px;
     width: 100%;
     margin: auto;
+
+    overflow: scroll;
+    -webkit-flex: 0 0 auto;
+    flex: 0 0 auto;
 }
 
 .mx_RoomView_messagePanel {