Add CssClass property to hyperlink
<asp:HyperLink ID="HyperLink1" NavigateUrl="~/registration.aspx" runat="server" CssClass="hyp">New registration</asp:HyperLink>
<style type="text/css">
.hyp
{
text-decoration:none;
z-index: 1;
top: 173px;
position: absolute;
height: 26px;
width: 110px;
left: 1081px;
}
</style>