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HTML

              
                <link href="https://fonts.googleapis.com/css?family=Roboto:400,500,700" rel="stylesheet">
<div class="box">
	<h2>Bootstrap Selectpicker Without Bootstrap</h2>
	<select class="selectpicker" data-size="4">
		<option value="">Select Custom Field</option>
								<option value="nickname">nickname</option>
								<option value="first_name">first_name</option>
								<option value="last_name">last_name</option>
								<option value="syntax_highlighting">syntax_highlighting</option>
								<option value="_ppm_wp_password_expired">_ppm_wp_password_expired</option>
								<option value="_ppm_wp_delayed_reset">_ppm_wp_delayed_reset</option>
								<option value="wc_last_active">wc_last_active</option>
								<option value="last_update">last_update</option>
								<option value="billing_first_name">billing_first_name</option>
								<option value="billing_last_name">billing_last_name</option>
								<option value="billing_address_1">billing_address_1</option>
								<option value="billing_city">billing_city</option>
								<option value="billing_state">billing_state</option>
								<option value="billing_postcode">billing_postcode</option>
								<option value="billing_country">billing_country</option>
								<option value="billing_email">billing_email</option>
								<option value="billing_phone">billing_phone</option>
								<option value="__my_wishlist">__my_wishlist</option>
								<option value="billing_company">billing_company</option>
								<option value="billing_address_2">billing_address_2</option>
								<option value="shipping_first_name">shipping_first_name</option>
								<option value="shipping_last_name">shipping_last_name</option>
								<option value="shipping_company">shipping_company</option>
								<option value="shipping_address_1">shipping_address_1</option>
								<option value="shipping_address_2">shipping_address_2</option>
								<option value="shipping_city">shipping_city</option>
								<option value="shipping_postcode">shipping_postcode</option>
								<option value="shipping_country">shipping_country</option>
								<option value="shipping_state">shipping_state</option>
	</select>
</div>
              
            
!

CSS

              
                .bootstrap-select.open > .dropdown-menu{
	/*display: block;*/
	opacity: 1;
	visibility: visible;
	pointer-events: auto;
	-webkit-transform: scale(1) translateY(0);
	-ms-transform: scale(1) translateY(0);
	transform: scale(1) translateY(0);
}
.bootstrap-select > .dropdown-menu{
	/*display: none;*/
	opacity: 0;
	max-height: 330px !important;
	visibility: hidden;
	overflow: hidden;
	-webkit-transform-origin: 50% 0;
	-ms-transform-origin: 50% 0;
	transform-origin: 50% 0;
	-webkit-transform: scale(0.85) translateY(-5px);
	-ms-transform: scale(0.85) translateY(-5px);
	transform: scale(0.85) translateY(-5px);
	-webkit-transition: all 0.2s cubic-bezier(0.5, 0, 0, 1.25), opacity 0.15s ease-out;
	transition: all 0.2s cubic-bezier(0.5, 0, 0, 1.25), opacity 0.15s ease-out;
}

body{
	background: #D1DCE4;
	font-family: 'Roboto', sans-serif;
}
.box{
	width: 400px;
	height: 120px;
	position: absolute;
	margin: auto;
	left: 0;
	right: 0;
	bottom: 0;
	top: 0;
}
h2{
	text-align: center;
}
.bootstrap-select:not([class*=col-]):not([class*=form-control]):not(.input-group-btn){
	width: 100%;
}
.bootstrap-select>.dropdown-toggle{
	background: #EDF2F5;
	border: 0;
	width: 100%;
	display: block;
	padding: 16px 15px;
	color: #000000;
	font-size: 14px;
	font-weight: 500;
	letter-spacing: 0.030em;
	-webkit-border-radius: 4px;
	-moz-border-radius: 4px;
	border-radius: 4px;
	cursor: pointer;
	font-family: 'Roboto', sans-serif;
}
.bootstrap-select>.dropdown-toggle.bs-placeholder, .bootstrap-select>.dropdown-toggle.bs-placeholder:active, .bootstrap-select>.dropdown-toggle.bs-placeholder:focus, .bootstrap-select>.dropdown-toggle.bs-placeholder:hover{
	color: #000;
}
.dropdown-toggle::after {
	content: "";
	position: absolute;
	border-top: .5em solid;
	border-right: .5em solid transparent;
	border-bottom: 0;
	border-left: .5em solid transparent;
	right: 10px;
	top: 48%;
}
.dropdown-menu{
	box-shadow: 0px 0px 15px rgba(60, 76, 150, 0.1);
	-webkit-box-shadow: 0px 0px 15px rgba(60, 76, 150, 0.1);
	-moz-box-shadow: 0px 0px 15px rgba(60, 76, 150, 0.1);
	position: absolute;
	left: 0;
	background: #fff;
	min-width: 100% !important;
	width: 100% !important;
}
.bootstrap-select .dropdown-menu a{
	display: block;
	padding: 8px 15px;
	font-size: 14px;
	font-weight: 500;
	letter-spacing: 0.030em;
}
              
            
!

JS

              
                /* ========================================================================
 * Bootstrap: dropdown.js v3.4.1
 * https://getbootstrap.com/docs/3.4/javascript/#dropdowns
 * ========================================================================
 * Copyright 2011-2019 Twitter, Inc.
 * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
 * ======================================================================== */


+function ($) {
  'use strict';

  // DROPDOWN CLASS DEFINITION
  // =========================

  var backdrop = '.dropdown-backdrop'
  var toggle   = '[data-toggle="dropdown"]'
  var Dropdown = function (element) {
    $(element).on('click.bs.dropdown', this.toggle)
  }

  Dropdown.VERSION = '3.4.1'

  function getParent($this) {
    var selector = $this.attr('data-target')

    if (!selector) {
      selector = $this.attr('href')
      selector = selector && /#[A-Za-z]/.test(selector) && selector.replace(/.*(?=#[^\s]*$)/, '') // strip for ie7
    }

    var $parent = selector !== '#' ? $(document).find(selector) : null

    return $parent && $parent.length ? $parent : $this.parent()
  }

  function clearMenus(e) {
    if (e && e.which === 3) return
    $(backdrop).remove()
    $(toggle).each(function () {
      var $this         = $(this)
      var $parent       = getParent($this)
      var relatedTarget = { relatedTarget: this }

      if (!$parent.hasClass('open')) return

      if (e && e.type == 'click' && /input|textarea/i.test(e.target.tagName) && $.contains($parent[0], e.target)) return

      $parent.trigger(e = $.Event('hide.bs.dropdown', relatedTarget))

      if (e.isDefaultPrevented()) return

      $this.attr('aria-expanded', 'false')
      $parent.removeClass('open').trigger($.Event('hidden.bs.dropdown', relatedTarget))
    })
  }

  Dropdown.prototype.toggle = function (e) {
    var $this = $(this)

    if ($this.is('.disabled, :disabled')) return

    var $parent  = getParent($this)
    var isActive = $parent.hasClass('open')

    clearMenus()

    if (!isActive) {
      if ('ontouchstart' in document.documentElement && !$parent.closest('.navbar-nav').length) {
        // if mobile we use a backdrop because click events don't delegate
        $(document.createElement('div'))
          .addClass('dropdown-backdrop')
          .insertAfter($(this))
          .on('click', clearMenus)
      }

      var relatedTarget = { relatedTarget: this }
      $parent.trigger(e = $.Event('show.bs.dropdown', relatedTarget))

      if (e.isDefaultPrevented()) return

      $this
        .trigger('focus')
        .attr('aria-expanded', 'true')

      $parent
        .toggleClass('open')
        .trigger($.Event('shown.bs.dropdown', relatedTarget))
    }

    return false
  }

  Dropdown.prototype.keydown = function (e) {
    if (!/(38|40|27|32)/.test(e.which) || /input|textarea/i.test(e.target.tagName)) return

    var $this = $(this)

    e.preventDefault()
    e.stopPropagation()

    if ($this.is('.disabled, :disabled')) return

    var $parent  = getParent($this)
    var isActive = $parent.hasClass('open')

    if (!isActive && e.which != 27 || isActive && e.which == 27) {
      if (e.which == 27) $parent.find(toggle).trigger('focus')
      return $this.trigger('click')
    }

    var desc = ' li:not(.disabled):visible a'
    var $items = $parent.find('.dropdown-menu' + desc)

    if (!$items.length) return

    var index = $items.index(e.target)

    if (e.which == 38 && index > 0)                 index--         // up
    if (e.which == 40 && index < $items.length - 1) index++         // down
    if (!~index)                                    index = 0

    $items.eq(index).trigger('focus')
  }


  // DROPDOWN PLUGIN DEFINITION
  // ==========================

  function Plugin(option) {
    return this.each(function () {
      var $this = $(this)
      var data  = $this.data('bs.dropdown')

      if (!data) $this.data('bs.dropdown', (data = new Dropdown(this)))
      if (typeof option == 'string') data[option].call($this)
    })
  }

  var old = $.fn.dropdown

  $.fn.dropdown             = Plugin
  $.fn.dropdown.Constructor = Dropdown


  // DROPDOWN NO CONFLICT
  // ====================

  $.fn.dropdown.noConflict = function () {
    $.fn.dropdown = old
    return this
  }


  // APPLY TO STANDARD DROPDOWN ELEMENTS
  // ===================================

  $(document)
    .on('click.bs.dropdown.data-api', clearMenus)
    .on('click.bs.dropdown.data-api', '.dropdown form', function (e) { e.stopPropagation() })
    .on('click.bs.dropdown.data-api', toggle, Dropdown.prototype.toggle)
    .on('keydown.bs.dropdown.data-api', toggle, Dropdown.prototype.keydown)
    .on('keydown.bs.dropdown.data-api', '.dropdown-menu', Dropdown.prototype.keydown)

}(jQuery);


$(function () {
	$('.selectpicker').selectpicker();
});
              
            
!
999px

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