Adds a button on the end of a field. Useful to display one-field forms in a compact space.
buttonFields are compatible with help text below, but not with labels.
Example
<form>
<div class="buttonField">
<input type="text" id="">
<button type="submit" class="buttonField-button button cta">Submit</button>
</div>
<div class="helpBlock">Enter your info, then click the button</div>
</form>