How do align center "ui-icon-check" CSS?

[apssiva]

I want to center the ui-icon-check.

I tried, but it not display center.

if($rs['status'] == 'present'){

							$tbl .= '<td style="text-align:center;"><a href="/modules/attendance/change_attendance.php?c='.getNameOfStudent($id).'&class='.$class.'" title="present" target="_blank"><span class="ui-icon ui-icon-check"></span></a>&nbsp;</td>';

							

						}elseif($rs['status'] == 'absent' || $rs['status'] == 'Absent'){

							$tbl .= '<td style="text-align:center;"><a href="javascript:void(0);" title="absent"><span class="ui-icon ui-icon-closethick"></span></a>&nbsp;</td>';

							

}

[drhowarddrfine]

Won't help unless you show the generated html and css.