message: fix z order of scrims vs toolbars
diff: cursor: pointer;
  }
  +/* these classes comes from the ember-sidebars addon. We need to the
  + z-indices of the sidebars so they stay on top of the scrims
  + provided by ember-overlays. */
  +.cst-right, .cst-top {
  + z-index: 10;
  +}
  +
  .cardstack-toolbox {
  height: 100vh;
  