<div class="input-group input-group-sm mb-3">
  <input type="number" class="form-control" placeholder="DarthVader" aria-label="Modifica il prezzo" aria-describedby="basic-addon">
  <span class="input-group-text" id="basic-addon">
        <i class="bi bi-currency-euro"></I>
    </span>
</div>