import mistune

def main(meta, content, level):
    """A Bootstrap-style alert.
    """
    # We want to be able to write our body content in Markdown,
    # so we use the `mistune` library to convert it to HTML.
    html = mistune.markdown(content)
    return '<div class="alert alert-{0}" role="alert">{1}</div>'.format(level, html)