asp.net - How to apply CSS style on ComboBox list items

ComboBox list items CSS style
DesignComboBoxListItemElements.aspx

<%@ Page Language="C#" AutoEventWireup="true" %>

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

<!DOCTYPE html>
<script runat="server">
    
</script>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Ajax ComboBox - How to use css to design ComboBox list item elements in asp.net</title>
    <style type="text/css">
        .GreenTypeComboBoxStyle .ajax__combobox_itemlist li {
            background-color: DarkGreen;
            border: 1px solid YellowGreen;
            color: White;
            font-size:medium;
            font-family:Courier New;
            padding-bottom: 5px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <h2 style="color:DarkBlue; font-style:italic;">
            ASP.NET Ajax ComboBox - How to use css to design
            <br /> ComboBox list item elements in asp.net
        </h2>
        <hr width="525" align="left" color="LightBlue" />
        <asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">
        </asp:ToolkitScriptManager>
        <br /><br />
        <asp:ComboBox 
            ID="ComboBox1" 
            runat="server" 
            DropDownStyle="DropDown"
            AutoCompleteMode="None"
            AutoPostBack="false"
            RenderMode="Block"
            CssClass="GreenTypeComboBoxStyle"
            >
              <asp:ListItem Text="GoldenRod"></asp:ListItem>
              <asp:ListItem Text="FloralWhite"></asp:ListItem>
              <asp:ListItem Text="DeepPink"></asp:ListItem>
              <asp:ListItem Text="DarkSlateBlue"></asp:ListItem>
              <asp:ListItem Text="DarkGoldenRod"></asp:ListItem>
              <asp:ListItem Text="Chocolate"></asp:ListItem>
              <asp:ListItem Text="BlanchedAlmond"></asp:ListItem>
        </asp:ComboBox>
    </div>
    </form>
</body>
</html>
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