@ionic/core/dist/collection/components/select-popover/select-popover.css

Base components for Ionic

:host ion-list {
  margin-left: 0;
  margin-right: 0;
  margin-top: -1px;
  margin-bottom: -1px; }

:host ion-list-header,
:host ion-label {
  margin-left: 0;
  margin-right: 0;
  margin-top: 0;
  margin-bottom: 0; }