message: elevation shadow for custom select
diff: box-sizing: border-box;
  border: solid 1px var(--field_border);
  border-top: 0;
  + box-shadow: 0 2px 2px rgba(0, 0, 0, .06), 0 0 2px rgba(0, 0, 0, .03);
  border-radius: 0 0 8px 8px;
  max-height: 132px;
  z-index: 2;
  