CSS IE 10 design disturb

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CSS

Hi Every One,

Please help on version compare design issues on css .Net ,this css using on grid now problem is
IE 10 design disturb Please Look into the below code

.fixedHeader12345
{
background-color: #D2A570;
color: #693828;
height: 25px;
font-weight: bold;
font-size: 11px;
padding-top: 1px;
border-top: 1px;
border-top-color: #632423;
font-family: Arial,Verdana,Helvetica,sans-serif;
text-align: center;
position: absolute;
height: 20px;
top: expression(Sys.UI.DomElement.getBounds(document.getElementById('<%=Panel3.ClientID%>')).y-36);
}