message: dropdown drop-shadow tweak
diff: .Dropdown-panel {
  background-color: var(--background);
  border-radius: 6px;
  - border: solid 1px var(--line-rule-color);
  - box-shadow: 4px 4px 12px 4px rgba(0,0,0,0.025);
  + border: none;
  + box-shadow:
  + 0px 4px 12px 0px rgba(0,0,0,0.08),
  + 0px 2px 4px 0px rgba(0,0,0,0.08);
  display: none;
  - min-width: 140px;
  + min-width: 160px;
  overflow: hidden;
  pointer-events: none;
  position: absolute;
  