diff --git a/res/css/structures/_MainSplit.scss b/res/css/structures/_MainSplit.scss
index f05f24d0d7..9597083e9c 100644
--- a/res/css/structures/_MainSplit.scss
+++ b/res/css/structures/_MainSplit.scss
@@ -19,6 +19,7 @@ limitations under the License.
     flex-direction: row;
     min-width: 0;
     height: 100%;
+    justify-content: space-between;
 }
 
 .mx_MainSplit > .mx_RightPanel_ResizeWrapper {
diff --git a/res/css/structures/_RoomView.scss b/res/css/structures/_RoomView.scss
index cd8c640132..5240a0650f 100644
--- a/res/css/structures/_RoomView.scss
+++ b/res/css/structures/_RoomView.scss
@@ -121,6 +121,7 @@ limitations under the License.
     position: relative; //for .mx_RoomView_auxPanel_fullHeight
     display: flex;
     flex-direction: column;
+    width: 100%;
 }
 
 .mx_RoomView_body {