not needed anymore

also confuses resizer offset calculation,
which will need to be fixed regardlessly though

res/css/structures/_LeftPanel.scss

@@ -48,7 +48,6 @@ limitations under the License.
 .mx_LeftPanel {
     background-color: $secondary-accent-color;
     flex: 1;
-    position: relative;
     overflow-x: hidden;
     display: flex;
     flex-direction: column;