[RbnJrg]

And what about something like this (that also works in any ereader):



The above screenshot belongs to ADE 3.0 and to get that result, you only need a few lines of code:

Spoiler:

h3 {
   text-align: center;
}

.stanza {
   margin-left: 4em;
   margin-bottom: 1em;
}

.stanza p {
  margin: 0;
  text-indent: 1.2em;
  line-height: 1.2em;
}

.stanza p + p {
  text-indent: 0;
}

.stanza p.number {
  float: left;
  margin-left: -4em;
  margin-top: 0.3em;
  font-size: 70%;
}

and in the .xhtml file:

Spoiler:

  <h3>IL CINQUE MAGGIO</h3>

  <div class="stanza">
    <p>Ei fu. Siccome immobile,</p>
    <p>Dato il mortal sospiro,</p>
    <p>Stette la spoglia immemore</p>
    <p>Orba di tanto spiro,</p>
    <p class="number">5</p>
    <p>Così percossa, attonita</p>
    <p>La terra al nunzio sta,</p>
  </div>

  <div class="stanza">
    <p>Muta pensando all’ultima</p>
    <p>Ora dell’uom fatale;</p>
    <p>Nè sa quando una simile</p>
    <p class="number">10</p>
    <p>Orma di piè mortale</p>
    <p>La sua cruenta polvere</p>
    <p>A calpestar verrà.</p>
  </div>

  <div class="stanza">
    <p>Lui folgorante in solio</p>
    <p>Vide il mio genio e tacque;</p>
    <p class="number">15</p>
    <p>Quando, con vece assidua,</p>
    <p>Cadde, risorse e giacque,</p>
    <p>Di mille voci al sonito</p>
    <p>Mista la sua non ha:</p>
  </div>

So, you only need to add <p class="number">"your number here"</p> in the proper place; everything else is the same you have done always.

Below you can check the respective epub.

Regards
Rubén