How to change outlay of my grid view

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C#3.0

C#

ASP.NET

.NET

.NET4

I have created one grid view.following is the code

<asp:GridView ID="GridView1" runat="server" EnableModelValidation="True"
                ForeColor="#333333" GridLines="None" AutoGenerateColumns="False" CssClass="mGrid1"
                  >
                <AlternatingRowStyle BackColor="Silver" ForeColor="#284775" />
                <Columns>
                    <asp:TemplateField HeaderText="Select">
                        <ItemTemplate>
                            <asp:CheckBox ID="Mycheck" runat="server" />
                        </ItemTemplate>
                        <HeaderStyle BorderColor="White" BorderStyle="Solid" BorderWidth="2px" 
                            CssClass="bg" />
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="ContactID" Visible="False">
                        <ItemTemplate>
                            <asp:Label ID="LblContactID" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "ContactID")%>'></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="Name">
                        <ItemTemplate>
                            <asp:Label ID="LblContactName" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "FirstName")%>'></asp:Label>
                            <asp:Label ID="Label1" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "LastName")%>'></asp:Label>
                        </ItemTemplate>
                        <HeaderStyle BorderColor="White" BorderStyle="Solid" BorderWidth="2px" 
                            CssClass="bg" />
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="CompanyID" Visible="False">
                        <ItemTemplate>
                            <asp:Label ID="LblCompanyID" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "CompanyID")%>'></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="Company">
                        <ItemTemplate>
                            <asp:Label ID="LblCompany" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "CompanyName")%>'></asp:Label>
                        </ItemTemplate>
                         <HeaderStyle BorderColor="White" BorderStyle="Solid" BorderWidth="2px" 
                            CssClass="bg" />
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="Mobile No.">
                        <ItemTemplate>
                            <asp:Label ID="LblMobileNumber" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "MobileNumber")%>'></asp:Label>
                        </ItemTemplate>
                         <HeaderStyle BorderColor="White" BorderStyle="Solid" BorderWidth="2px" 
                            CssClass="bg" />
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="BusinessID" Visible="False">
                        <ItemTemplate>
                            <asp:Label ID="LblBusinessID" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "BusinessID")%>'></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="TypeOfBusiness" Visible="False">
                        <ItemTemplate>
                            <asp:Label ID="LblTypeOfBusiness" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "TypeOfBusiness")%>'></asp:Label>
                        </ItemTemplate>
                         <HeaderStyle BorderColor="White" BorderStyle="Solid" BorderWidth="2px" 
                            CssClass="bg" />
                    </asp:TemplateField>
                     <asp:TemplateField HeaderText="Country">
                            <ItemTemplate>
                                <asp:Label ID="LblCountry" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "Country")%>'></asp:Label>
                            </ItemTemplate>
                             <HeaderStyle BorderColor="White" BorderStyle="Solid" BorderWidth="2px" />
                            <HeaderStyle BorderColor="White" BorderStyle="Solid" BorderWidth="2px" 
                                BackColor="#74ABD4" />
                        </asp:TemplateField>
                        <asp:TemplateField HeaderText="State">
                            <ItemTemplate>
                                <asp:Label ID="LblState" runat="server" Text='<%#DataBinder.Eval(Container.DataItem, "State")%>'></asp:Label>
                            </ItemTemplate>
                             <HeaderStyle BorderColor="White" BorderStyle="Solid" BorderWidth="2px" />
                            <HeaderStyle BorderColor="White" BorderStyle="Solid" BorderWidth="2px" 
                                BackColor="#74ABD4" />
                        </asp:TemplateField>
                </Columns>
                <EditRowStyle BackColor="#999999" />
                <FooterStyle BackColor="#5D7B9D" Font-Bold="True" ForeColor="White" />
                     <HeaderStyle BackColor="#74ABD4" Font-Bold="false" Width="100" ForeColor="White" />
                <PagerStyle BackColor="#284775" ForeColor="White" HorizontalAlign="Center" />
                <RowStyle BackColor="#F7F6F3" ForeColor="#333333" Height="30px" />
                <SelectedRowStyle BackColor="#E2DED6" Font-Bold="True" ForeColor="#333333" />
            </asp:GridView>

and took one stlesheet grid.css

.mGrid1
{
   
    font-family: tahoma;
    
    
}
 
.mGrid1 td   /* this applies to the Gridviews Data fileds */
{
    padding: 1px;
    text-align:center;
    width: 3%;
   
    border-collapse: collapse;
}
.mGrid1 th   /* this applies to the Gridviews Headers */
{
     padding: 0px 0px;
     border-width: 1px;
}
.bg
{
    background: #74ABD4;
}

now what i want first column first row header "select" should have less width as compared to other .i am unable to achieve this pls tell......
regards