Highcharts Demo

author(s): Torstein Hønsi

HTML

<select multiple>
      <option value="volvo">Volvo</option>
      <option value="saab">Saab</option>
      <option value="mercedes">Mercedes</option>
      <option value="audi">Audi</option>
    </select>

CSS

select{height:50px}
select:focus{height:auto}