JSFiddle - React, Tailwind, and code Playground

HTML

<div class="controls">
    <select id="expirymonth" class="form-control form-control-inline">
        <option value="01">01 - January</option>
        <option value="02">02 - February</option>
        <option value="03">03 - March</option>
        <option value="12">12 - December</option>
    </select>
    <select id="expiryyear" class="form-control form-control-inline">
        <option value="2014">2014</option>
        <option value="2015">2015</option>
        <option value="2016">2016</option>
    </select>
</div>

CSS

@import url('http://getbootstrap.com/dist/css/bootstrap.css');

.form-control-inline {
    min-width: 0;
    width: auto;
    display: inline;
}