How to give each GridView inside the Repeater a different color?

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C#

ASP.NET

Hello,

I have a repeater and three GridViews inside the repeater. Each GridView has different columns than the others since I have a storedprocedure and each GridView has differend columns based on the value of the HiddenField inside the repeater.

Now I would like to give each GridView a different color especially for the columns that are different in each GridView, but I don't know how to do that.

My code:

<asp:Repeater ID="Repeater1" runat="server" DataSourceID="SqlDataSource1">
            <itemtemplate>
                
                <asp:HiddenField ID="HiddenField1" runat="server" Value='<%# Eval("GroupID")%>' />
                
                <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                                    ConnectionString="<%$ ConnectionStrings:testConnectionString %>" 
                                    SelectCommandType="StoredProcedure" SelectCommand="kbiReport"
                                    FilterExpression="[Division] like '{0}%' and [Organization] like '{1}%'">
                        

                    <SelectParameters>
                        <%--ControlParameter is linked to the HiddenField above to generate different GridView based on different values 
                            of GroupID--%>
                        <asp:ControlParameter ControlID="HiddenField1" Name="GroupID" PropertyName="Value" />
                    </SelectParameters>
                

                <asp:GridView ID="GridView1" runat="server" 
                                AllowSorting="True" 
                                CellPadding="3" 
                                DataSourceID="SqlDataSource1" 
                                CssClass="mGrid"
                                AlternatingRowStyle-CssClass="alt" 
                                RowStyle-HorizontalAlign="Center">
                    <alternatingrowstyle backcolor="White" forecolor="#284775" />
                    <columns>
                        <asp:CommandField ShowSelectButton="True" />
                    </columns>
                
                

            </itemtemplate>
        
        
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
                           ConnectionString="<%$ ConnectionStrings:testConnectionString %>"
                           SelectCommand="SELECT DISTINCT GroupID FROM courses">