How to apply css for dropdownList in MVC .net?

How to apply css for dropdownList in MVC .net?, someone asked me to explain?

Create a css class with style property and apply to dropdrownlist.

mydrowpdownstyle{
        background-color: blue;
 color:white;
 }
  @Html.DropDownList("Category", null, "Select Category", new { Class = "mydrowpdownstyle" })

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