JSFiddle - React, Tailwind, and code Playground

HTML

<link href="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/css/select2.css" rel="stylesheet"/>

<select class="multiplo" name="" multiple="multiple">
  <option>Um</option>
  <option>Dois</option>
  <option>TrĂŞs</option>
  <option>Quatro</option>
</select>

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/js/i18n/pt-BR.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/select2/4.0.5/js/select2.js"></script>

CSS

.multiplo{
width:50%;
}

JavaScript

$('.multiplo').select2({
  placeholder: 'selecione'
});