zulip/templates/zerver/portico-header.html

<div class="header">
    <div class="header-main" id="top_navbar">
        <div class="column-left">
            <div>
                {% if custom_logo_url %}
                <a class="brand logo" href="{{ root_domain_uri }}/"><img draggable="false" src="{{ custom_logo_url }}" class="portico-logo" alt="{{ _('Zulip') }}" content="Zulip" /></a>
                {% else %}
                <a class="brand logo" href="{{ root_domain_uri }}{% if page_is_help_center %}/help/{% endif %}">
                    <svg class="brand-logo" xmlns:svg="http://www.w3.org/2000/svg" xmlns="http://www.w3.org/2000/svg" width="100%" height="100%" viewBox="0 0 40 40" version="1.1">
                        <g transform="translate(-297.14285,-466.64792)">
                            <circle cx="317.14285" cy="486.64792" r="19.030317" style="fill:#fff;stroke-width:1.93936479;stroke:transparent"></circle>
                            <path d="m309.24286 477.14791 14.2 0 1.6 3.9-11.2 11.9 9.6 0 1.6 3.2-14.2 0-1.6-3.9 11.2-11.9-9.6 0z" style="fill:#52c2af;stroke:#52c2af"></path>
                        </g>
                    </svg>
                    <span>Zulip</span>
                    {% if page_is_help_center %}
                    <div class="light"> <pipe>|</pipe> User Documentation</div>
                    {% endif %}
                </a>
                {% endif %}
            </div>
        </div>

        <div class="column-right top-links">
            {% if login_link_disabled %}
            {% elif not only_sso %}
            <a href="{{login_url}}">{{ _('Log in') }}</a>
            {% endif %}

            {% if register_link_disabled %}
            {% elif only_sso %}
            <a href="{{ url('login-sso') }}">{{ _('Log in') }}</a>
            {% else %}
            <a href="{{ url('register') }}">{{ _('Register') }}</a>
            {% endif %}
        </div>
    </div>
</div>