JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<span><a id="click" href="#" data-toggle="modal" data-target=".modal">Click</a></span>

<div class="modal fade" tabindex="-1" role="dialog" aria-labelledby="myLargeModalLabel">
    <div class="modal-dialog modal-lg">
        <div class="modal-content">
            <input type="text" class="form-control">
        </div>
    </div>
</div>

CSS

input:focus {background-color: #E6FF99}

JavaScript

$('#click').click(function () {
    $('input').focus()
})