message: refactor(protocol-designer): Remove grey overlay for liquid placement modal
  closes
diff: .liquid_placement_modal {
  @apply (--absolute-fill);
  - background-color: rgba(100, 100, 100, 0.8);
  + background-color: rgba(0, 0, 0, 0.9);
  z-index: 1;
  /* make up lost space for overlay */
  