JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.1.1/js/bootstrap.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.1.1/css/bootstrap.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.5.4/bootstrap-select.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/bootstrap-select/1.5.4/bootstrap-select.css">
<strong>Option 1</strong>
<select class="selectpicker" name="number">
    <option value="1">1</option>
    <option value="2">2</option>
    <option value="3">3</option>
    <option value="4">4</option>
    <option value="5">5</option>
</select>
<br />

<strong>Option 2</strong>
<select class="selectpicker" name="abc">
    <option value="1">A</option>
    <option value="2">B</option>
    <option value="3">C</option>
    <option value="4">D</option>
    <option value="5">E</option>
</select>

JavaScript

$('.selectpicker').selectpicker({
          style: 'btn-info',
          size: 4
      });

$("select").change(function(){
    $("select").val($(this).val());
    $('.selectpicker').selectpicker('refresh');
});