zola/components/templates/src/builtins/shortcodes/streamable.html

<div {% if class %}class="{{class}}"{% endif %}>
    <iframe src="https://www.streamable.com/e/{{id}}" 
            scrolling="no"
            frameborder="0"
            allowfullscreen mozallowfullscreen webkitallowfullscreen>
    </iframe>
</div>