I can change the "checkbox" to "radio" but it still allows more than one to be selected. What can I do to only allow a single selection? Here's the site: https://winkdiapers.com/product/os-pocket-diaper
<div class="clearfix">
{% for index, extra in product.extras %}
<div class="extra">
<label class="title" for="{{ 'extra-'~index }}">
{% if extra.enabled %}
<input type="checkbox" id="{{ 'extra-'~index }}" {{ checkbox_state(postedExtras[extra.id], extra.id) }} name="extras[{{ extra.id }}]" data-ajax-handler="shop:product" data-ajax-update="#product-page=shop-product">
{% else %}
<input type="checkbox" disabled="disabled">
{% endif %}
{{ extra.name }} ({{ extra.price|currency }})</label>
</div>
{% endfor %}
</div>
{% endif %}