Fix room views not having proper container

res/css/structures/_RoomView.scss

@@ -14,6 +14,13 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
+.mx_RoomView_wrapper {
+    display: flex;
+    flex-direction: column;
+    flex: 1;
+    position: relative;
+}
+
 .mx_RoomView {
     word-wrap: break-word;
     display: flex;

src/components/structures/LoggedInView.tsx

@@ -656,7 +656,9 @@ class LoggedInView extends React.Component<IProps, IState> {
                             />
                             <ResizeHandle />
                         </div>
-                        { pageElement }
+                        <div className="mx_RoomView_wrapper">
+                            { pageElement }
+                        </div>
                     </div>
                 </div>
                 <CallContainer />