app\templates\_users(1).html

<ul class="users">
    {% for user in users %}
    <li class="user">
        <div class="user-thumbnail">
            <a href="{{ url_for('.user', username=user.username) }}">
                <img class="img-rounded profile-thumbnail" src="{{ user.gravatar(size=40) }}">
            </a>
        </div>
        <div class="user-info">
            <div class="user-username">
                <a href="{{ url_for('.user', username=user.username) }}">{{ user.username }}</a>
            </div>
        </div>
    </li>
    {% endfor %}
</ul>