Create and apply .skin (Theme) file
<%--
Default skin template. The following skins are
provided as examples only.
1. Named control skin. The SkinId should be
uniquely defined because
duplicate SkinId's per control type are not allowed in the same theme.
<asp:GridView runat="server"
SkinId="gridviewSkin" BackColor="White" >
<AlternatingRowStyle BackColor="Blue" />
</asp:GridView>
2. Default skin. The SkinId is not defined. Only
one default
control
skin per control type is allowed in the same theme.
<asp:Image runat="server"
ImageUrl="~/images/image1.jpg" />
--%>
<asp:TextBox
Bordercolor="Blue"
backcolor="Pink"
runat="server"
/>
<asp:Button
Bordercolor="Black"
backcolor="Yellow"
runat="server"
/>