<script>
$(function () {
  var nua = navigator.userAgent
  var isAndroid = (nua.indexOf('Mozilla/5.0') > -1 && nua.indexOf('Android ') > -1 && nua.indexOf('AppleWebKit') > -1 && nua.indexOf('Chrome') === -1);
  if (isAndroid) {
    $('select.select_class_name').removeClass('select_class_name').css('width', '100%');
  }
})
</script>