field-adder {
  --popover-border: solid 1px #ccc;
  --popover-shadow: 0 0.5rem 0.5rem #3333;

  height: 100%;
  
  & button.expander {
      appearance: none;
      border: none;
      width: 100%;
      height: 100%;
      font-weight: inherit;
      font-size: inherit;
      font-family: inherit;
      cursor: pointer;
      background: none;
  }
}