searxng/searx/templates/pix-art/search.html

<form method="{{ method or 'POST' }}" action="{{ url_for('index') }}" id="search_form">
    <div id="search_wrapper">
        <input type="text" autofocus placeholder="{{ _('Search for...') }}" id="q" class="q" name="q" tabindex="1" size="100" {% if q %}value="{{ q }}"{% endif %}/>
        <input type="submit" value="" id="search_submit" />
        {% for category in categories %}
        <input type="hidden" name="category_{{ category }}" value="1"/>
        {% endfor %}
    </div>
</form>