message: Fix left panel glow in Safari
  Add back removed CSS
diff: @@ -20,6 +20,15 @@ limitations under the License.
  z-index: 100;
  }
  +// We'd like to remove this, but this makes matrixchat's resizehandle's
  +// negative margin & greater than its positive padding. If it's the same
  +// or less, Safari gets confused about overflows somehow and
  +// https://github.com/vector-im/element-web/issues/19863 happens.
  +.mx_MatrixChat > .mx_ResizeHandle.mx_ResizeHandle_horizontal {
  + margin: 0 -10px 0 0;
  + padding: 0 8px 0 0;
  +}
  +
  .mx_ResizeHandle.mx_ResizeHandle_horizontal {
  margin: 0 -5px;
  padding: 0 5px;
  