JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<h3>FMUs
  <button type="button" class="btn btn-default btn-xs">
    <span class="glyphicon glyphicon-plus"></span>
  </button>
</h3>

CSS

button,
textarea {
  vertical-align: middle;
}