admin-lte-css-js/app/styles/bootstrap/select2.css

The default blueprint for ember-cli addons.

.select2-drop.zoner {
  background: #073855;
  color:#fff;

}
.select2-search input {
  padding: 0;
}
.select2-container.zoner .select2-choice {
    background: #073855;
    color:#fff;
}