How to show horizontal ScrollBar in a ListBox in asp.net

asp.net listbox horizontal scrollbar
listbox-horizontal-scrollbar.aspx

<%@ Page Language="C#" AutoEventWireup="true"%>    
      
<!DOCTYPE html>
        
<script runat="server">  
    protected void Page_Load(object sender, EventArgs e)  
    {
        if (!Page.IsPostBack)
        {
            string[] birds = { 
                                 "Antenna Satinbird",
                                 "Slaty-headed Longbill",
                                 "Saddleback",
                                 "Eastern Whipbird",
                                 "Spotted Quail-thrush",
                                 "Varied Lorikeet",
                                 "Musk Lorikeet"
                             };

            ListBox1.DataSource = birds;
            ListBox1.DataBind();
            ListBox1.Rows = ListBox1.Items.Count;
            ListBox1.BorderWidth = 0;
        }
    }
</script>        
        
<html xmlns="http://www.w3.org/1999/xhtml">        
<head id="Head1" runat="server">        
    <title>asp.net listbox horizontal scrollbar</title>
    <style type="text/css">
        .block { 
            display:inline-block;
            vertical-align:top;
            overflow-x:scroll;
            overflow-y:hidden;
            border:solid grey 1px;
            width:200px;
        }
        .block select { 
            padding:10px; 
            margin:-5px -20px -5px -5px;
        }
    </style>
</head>        
<body>        
    <form id="form1" runat="server">        
    <div>        
        <h2 style="color:MidnightBlue; font-style:italic;">        
            asp.net example - listbox horizontal scrollbar
        </h2>        
        <hr width="550" align="left" color="Gainsboro" />   
        <br />
        <div class="block">  
        <asp:ListBox  
            ID="ListBox1"  
            runat="server"  
            AutoPostBack="true"  
            Font-Size="X-Large"
            SelectionMode="Multiple"
            Font-Names="Comic Sans MS"  
            >  
        </asp:ListBox>  
        </div>
    </div>        
    </form>        
</body>        
</html>
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