[jQuery] Center text in the dropdown list (<select>)

gistfile1.js

var _optimize_selectbox_padding = function () {
  $(".search__county, .search__district").each(function () {
    var text_width = (parseInt($(this).css("font-size"), 10) * $(this).val().length);
    var padding = (($(this).outerWidth() - text_width) / 2);
    $(this).css("padding-left", padding);
  });
};

_optimize_selectbox_padding();
$(".search__county, .search__district").on("change", function () {
  _optimize_selectbox_padding();
});