JSFiddle - React, Tailwind, and code Playground
HTML
<link rel="stylesheet" href="http://twitter.github.com/bootstrap/1.4.0/bootstrap.min.css">
<form action="" class="form-stacked">
<fieldset>
<label for="xlInput3">Say something on Twitter</label>
<div class="textarea">
<textarea class="xlarge" id="xlInput3" name="xlInput3" rows="5" columns="20"></textarea>
</div>
</fieldset>
</form>
<button type="submit" value="Post to Twitter" class="btn small secondary">Post To Twitter</button>
CSS
.input-xlarge,
input.xlarge {
height: 20px;
}