Custom CSS

Hi,

I would like to change the text area size only for a specific text. Modifying this: <span class=”selector”><span class=”simple-selector selector-matches”>.ipt_uif_common.ipt-uif-custom-cupertino textarea.ipt_uif_textarea makes modifications on all text areas in the form. Is there a way to select for instance the text area (o) {29} from the form_id 24? </span></span>

Thanks