<div class="radio">
    <input type="hidden" name="elevator" value="">
    <label class="radio-inline" for="elevator-1">
        <input type="radio" name="elevator" value="1" id="elevator-1" checked="checked">
        <span class="circle">
            <span class="circle-active"></span>
        </span>ja
    </label>
    <label class="radio-inline" for="elevator-0">
        <input type="radio" name="elevator" value="0" id="elevator-0">
        <span class="circle">
            <span class="circle-active"></span>
        </span>nein
    </label>
</div>