td data not aligning properly - html

Question

I am new to Html designing. There is a small section of page that I have to design using html and CSS.
I have the back ground image with the image of login button. How to develop the Html of this so that it looks the same form in the attached picture.
Till now I have tried this but it is looking distorted:
<div class="dvEmployee">
<table border="0" cellpadding="0" cellspacing="0">
<tr>
<td>
<br />
<span class="EmployeeLable">Enter your employee number to vote </span>
</td>
</tr>
<tr>
<td>
<asp:TextBox runat="server" ID="txtEmpID" ValidationGroup="vdLog" CssClass="input"
Height="49px" Width="161px" /><br />
<asp:RequiredFieldValidator ID="rfgEmp" runat="server" ValidationGroup="vdLog" ControlToValidate="txtEmpID"
ErrorMessage="Please enter employee number!"></asp:RequiredFieldValidator>
<asp:Label runat="server" ID="lblError" Text="" CssClass="lblError"></asp:Label>
</td>
<td>
<asp:ImageButton ID="imgBtn" runat="server" ImageUrl="Images/log_in_button.png" ValidationGroup="vdLog"
AlternateText="Log In" OnClick="imgBtn_Click" />
</td>
</tr>
</table>
</div>
Css classes that I have made:
.dvEmployee
{
background-image: url('images/log_in_window.png');
background-repeat: no-repeat;
width: 466px;
height: 206px;
position: relative; /* padding: 100px 30px;*/
margin: 180px 107px;
z-index: 2000px;
}
.lblError
{
font: Arial Regular 12pt #000000;
}
.EmployeeLable
{
font-family: Arial regular;
font-size: 29pt;
color: #404040;
line-height: 17px;
}
Just to give all, following image is how it is currently looking:

Answer 1

use this srtuctuer :
<table>
<tr>
<td colspan="2">
<br />
<span class="EmployeeLable">Enter your employee number to vote </span>
</td>
</tr>
<tr>
<td class="center">
<asp:TextBox runat="server" ID="txtEmpID" ValidationGroup="vdLog" CssClass="input"
Height="49px" Width="161px" /><br />
<asp:RequiredFieldValidator ID="rfgEmp" runat="server" ValidationGroup="vdLog" ControlToValidate="txtEmpID"
ErrorMessage="Please enter employee number!"></asp:RequiredFieldValidator>
<asp:Label runat="server" ID="lblError" Text="" CssClass="lblError"></asp:Label>
</td>
<td class="center">
<asp:ImageButton ID="imgBtn" runat="server" ImageUrl="Images/log_in_button.png" ValidationGroup="vdLog"
AlternateText="Log In" OnClick="imgBtn_Click" />
</td>
</tr>
</table>
css :
.center{
text-align:center;
}