select.sphinxnotes-lilypond {
    width: 100%;
    margin-top: 5px;
    border-radius: 5px;
    padding: 10px;
}

audio.sphinxnotes-lilypond {
    /* width is dynamiclly set by HTML attributes, see :meth:`html_visit_lily_node` */
    margin-top: 5px;
    border-radius: 5px;
}