JSFiddle - React, Tailwind, and code Playground

HTML

<script src="http://multidatespickr.sourceforge.net/jquery-ui.multidatespicker.js"></script>
<input id="dates" type="text"/>
<div id="datePick" />

CSS

.ui-datepicker .ui-datepicker-calendar .ui-state-highlight a {
	background: #000; 
	color: white;
}

JavaScript

$('#datePick').multiDatesPicker({
	altField: '#dates',
});