Putting normal HTML in Default.aspx

I want to arrange my ASP.NET controls inside a table, presumably there is no problem in adding an HTML table element inside a <form element?

<asp:Content ID="BodyContent" runat="server" ContentPlaceHolderID="MainContent"> <form id="myform"> <br/> Type in your coupon or leave &quot;Demo&quot;, then select the appliance and fill in the data:<br /> <br /> <table width="80%"> <tr> <td> <asp:Label ID="Label5" runat="server" Text="Your Coupon:" Width="15%" BackColor="#CCFF33"></asp:Label></td> <td><asp:TextBox ID="CouponTb" runat="server" Width="15%" BackColor="#CCFF33">Demo</asp:TextBox></td> ...