Issue encountered while trying to add attributes to Asp ListBox's ListItems programmatically

My ListBox on the aspx page is displayed like this:

 <asp:ListBox ID="ddlItems" runat="server" Style="padding: 2px; width: 210px; height:200px;">
  </asp:ListBox>

To add a background image to my list items in the code behind, I am using the following code which works perfectly:

myListItem.Attributes.Add("style", "background-image:url('www.mysite.com/images/Gradient/" + ds.Tables[0].Rows[iGroups]["Backgroundimage"].ToString() + "');");

Now, I have been struggling to make the list items' font bold and white in color. Additionally, how can I adjust the height of the list items and increase the font size?

I have tried the following approaches, but they are not working as expected:

  myListItem.Attributes.Add("ForeColor", "White");
  myListItem.Attributes.Add("style", "font-weight:bold");
c#asp.netcss

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