HTML table Head Part does not move body part scrolling, Gocquan with growth

< style >

. table{width:100%;    Border-collapse:collapse; border-spacing:0;}

. Table Thead{Display:Block;width:100%;background:#ddd;}. Table Tbody{Display:Block;Height:70px;Overflow:Auto;width:100%;Border:1px solid #ddd;}. Table td,.table th{width:200px;Border-bottom:None;Border-left:None;Border-right:1px solid #CCC;Border-top:1px solid #DDD;padding:2px 3px 3px 4px}. Table TR{Border-bottom:1px solid #B74; } </style>

<Tableclass= "Table">                <thead>                <TR>                    <th>Header</th>                    <th>Header</th>                    <th>Header</th>                    <th>Header</th>                    <th>Header</th>                    <th>Header</th>                </TR>                </thead>                <tbodyclass= "M_scrollbar">                <TR>                    <TD>Fuck 1</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                </TR>                <TR>                    <TD>Fuck 1</TD>                    <TD>Fuc<BR>Kfuc<BR>Kfuc<BR>Kfuc<BR>Kfuc<BR>Kfuc<BR>Kfuc<BR>Kfuc<BR>Kfuc<BR>Kfuc<BR>Kfuc<BR>Kfuc<BR>Kfuc<BR>Kfuc<BR>K 2</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                </TR>                <TR>                    <TD>Fuck 1</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                </TR>                <TR>                    <TD>Fuck 1</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                    <TD>Fuck 2</TD>                </TR>                </tbody>            </Table>

HTML table Head Part does not move body part scrolling, Gocquan with growth