searxng/searx/templates/oscar/advanced.html

<div class="input-group col-sm-12 advanced">
    <input type="checkbox" id="check-advanced">
    <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>
</div>