mitmproxy/docs/_templates/layout.html

{% extends "!layout.html" %}
{% block sidebartitle %}
    <a href="https://mitmproxy.org/" style="margin-bottom: 7px; background: none !important;">
        <button class="btn btn-info">
            <i class="fa fa-arrow-left"></i>
            Return to mitmproxy.org
        </button>
    </a>
    {{ super() }}
{% endblock %}