Yotter/app/templates/_empty_feed.html

<div class="ui text container">
    <div class="ui row">
        <img class="ui medium circular image" src="{{ url_for('static',filename='img/empty.png') }}">
    </div>

    <div class="ui row">
        <h2 class="ui header">This feed is empty.</h2>
    </div>
</div>