searxng/searx/templates/oscar/advanced.html

<input type="checkbox" name="advanced_search" id="check-advanced" {% if advanced_search %} checked="checked"{% endif %}>
<label for="check-advanced">
    <span class="glyphicon glyphicon-cog"></span>
    {{ _('Advanced settings') }}
</label>
<div id="advanced-search-container">
    {% include 'oscar/categories.html' %}
    {% include 'oscar/time-range.html' %}
</div>