na střed2

Zdraví ještě jednou se zeptám, šlo by slovo rok, taky vycentrovat horizontálně na střed?? předem díky

        <center>        
        <meta http-equiv="content-type" content="text/html; charset=UTF-8">        
        <link rel="stylesheet" type="text/css" href="/css/result-light.css">        
        <style type='text/css'>        
        table {border-collapse:collapse;}        
        th.col {font-weight: normal;text-align: right;}        
        th.group {vertical-align: bottom;}        
        th.row {font-weight: normal;text-align: left;height: 12em;vertical-align: bottom;}        
        th div.vertical {position: relative;-moz-transform:rotate(-90deg);-moz-transform-origin: bottom left;-webkit-transform: rotate(-90deg);-webkit-transform-origin: bottom left;-o-transform: rotate(-90deg);-o-transform-origin: bottom left;transform: rotate(-90deg);transform-origin: bottom left;filter: progid:DXImageTransform.Microsoft.BasicImage(rotation=1);}        
        th div.vertical div {position: absolute;top: 16px;}        
        td, th {border: 1px solid black;}        
        td.blank {background-color: transparent;}        
        </style>        
        <table>        
<th style="width:50px;" class="row"> <div class="vertical"><div><b>kolo</th><th style="width: 250px;" class="row"> <div class="vertical"><div><b>ROK
                </table>                                
                </center>