diff --git a/modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/Index.cshtml b/modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/Index.cshtml
index 4ecf499593..0bdaa0c763 100644
--- a/modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/Index.cshtml
+++ b/modules/docs/src/Volo.Docs.Web/Pages/Documents/Project/Index.cshtml
@@ -260,7 +260,7 @@
                                                 <abp-column size="_4">
                                                     <div class="input-group">
                                                         <span class="input-group-text" id="@("Section" + parameter.Name + "ComboboxAddonId")">@(parameter.DisplayName)</span>
-                                                        <select class="doc-section-combobox form-control"
+                                                        <select class="doc-section-combobox form-select"
                                                                 aria-describedby="@("Section" + parameter.Name + "ComboboxAddonId")"
                                                                 id="@("Section" + parameter.Name + "ComboboxId")" data-key="@parameter.Name">
                                                             @foreach (var value in parameter.Values)