Fields Group

<div class="form-group">
    <div class="media media--small">
        <div class="media__body">
            <input type="text" class="field field--small">
        </div>
        <div class="media__right">
            <button class="btn btn--small btn--primary">Button</button>
        </div>
    </div>
</div>
<div class="form-group">
    <div class="media media--small">
        <div class="media__body">
            <input type="text" class="field">
        </div>
        <div class="media__right">
            <button class="btn btn--primary">Button</button>
        </div>
    </div>
</div>
<div class="form-group">
    <div class="media media--small">
        <div class="media__body">
            <input type="text" class="field field--large">
        </div>
        <div class="media__right">
            <button class="btn btn--large btn--primary">Button</button>
        </div>
    </div>
</div>