select box in multible option select using Ctrl(windows)/command(mac)

<select name="addons" multiple="multiple">
    <option>None</option>
        <option value="Music Man -RS: 1500 ">Music Man -RS: 1500</option>
        <option value="Bunch of Pink Lilies - RS: 500">Bunch of Pink Lilies - RS: 500</option>
        <option value="Bunch of White Lilies - RS: 500">Bunch of White Lilies - RS: 500</option>
        <option value="Bouquet of Red Roses - RS: 500">Bouquet of Red Roses - RS: 500</option>
        <option value="Cake Pops - RS: 150">Cake Pops - RS: 150</option>
        <option value="Teddy Bears - RS: 500">Teddy Bears - RS: 500</option>
    </select>