<div class="udata-oembed">
    <link rel="stylesheet" href="{{ static('oembed.css', _external=True) }}" />
    {% include theme(type + '/oembed.html') with context %}
</div>

<div class="udata-oembed">
    <link rel="stylesheet" href="{{ static('oembed.css', _external=True) }}" />
    {% block extra_css %}{% endblock %}
    {% include theme(type + '/oembed.html') with context %}
</div>

Allow theme to add extra css to OEmbed cards
Allow theme to add extra css to OEmbed cards
