twitter bootstrap - Need help in the CSS #unseen style -


i unseen th in first tr th in second tr disappeared. know how fix code first th contains "min." text can showed when media width smaller 640px? thank in advance! 

<!doctype html public "-//w3c//dtd xhtml 1.0 transitional//en" "http://www.w3.org/tr/xhtml1/dtd/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <meta http-equiv="x-ua-compatible" content="ie=9; ie=8; ie=7; ie=edge" /> <meta name="viewport" content="width=device-width, initial-scale=1">  <!-- latest compiled , minified css --> <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css"> <!-- jquery library --> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script> <!-- latest compiled javascript -->  <style type="text/css">      @media screen , (max-width: 800px) {         #unseen table th div {display: none;},     }      @media screen , (max-width: 640px) {         #unseen table th:nth-child(1),         #unseen table th:nth-child(6),         #unseen table th:nth-child(7),         #unseen table th:nth-child(8){display:none;},     </style>      <body>         <section id="unseen">                 <table class="table-bordered table-striped table-condensed productform" width="100%" cellspacing="0px">                 <thead>                     <tr style="border:solid 1px #ffffff;">                         <th rowspan="2">photo</th>                         <th rowspan="2">part number<div>/ description</div> </th>                         <th rowspan="2">color <div>/ nm</div></th>                         <th colspan="3">luminous intensity</th>                         <th rowspan="2">viewing<br />angle</th>                         <th rowspan="2">data<br />sheet</th>                         <th rowspan="2" colspan="2">3d spec<sup>†</sup></th>                         <th rowspan="2">request<br />for quote</th>                     </tr>                     <tr>                         <th>min.</th>                         <th>typ.</th>                         <th>unit</th>                     </tr>                 </thead>             </table>         </section>     </body>         </html>

you can use :first-child selector it. see fiddle http://jsfiddle.net/s281dopc/

#unseen table tr:first-child th:nth-child(1), #unseen table tr:first-child th:nth-child(6), #unseen table tr:first-child th:nth-child(7), #unseen table tr:first-child th:nth-child(8) {     display:none; }

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