forms_6_elements_prefix.html

<div class="row">
    <div class="small-12 columns">
        <label for="url_input">URL</label>
    </div>
</div>
<div class="row collapse">
    <div class="small-2 columns">
        <span class="prefix">http://</span>
    </div>
    <div class="small-10 columns">
        <input type="url" id="url_input" name="url_input"></input>
    </div>
</div>