diff --git a/src/BootstrapBlazor/Components/Dropdown/Dropdown.razor.cs b/src/BootstrapBlazor/Components/Dropdown/Dropdown.razor.cs
index 86fcfb3869e1310c885d1ffac2f58eeeea6f022d..30863d2266e2280b219a22f61e2f4cc81ede3416 100644
--- a/src/BootstrapBlazor/Components/Dropdown/Dropdown.razor.cs
+++ b/src/BootstrapBlazor/Components/Dropdown/Dropdown.razor.cs
@@ -55,7 +55,7 @@ namespace BootstrapBlazor.Components
         /// <summary>
         /// 菜单对齐方式样式
         /// </summary>
-        private string? MenuAlignmentClass => CssBuilder.Default("dropdown-menu")
+        private string? MenuAlignmentClass => CssBuilder.Default("dropdown-menu shadow")
             .AddClass($"dropdown-menu-{MenuAlignment.ToDescriptionString()}", MenuAlignment == Alignment.Right)
             .Build();
 
diff --git a/src/BootstrapBlazor/Components/Table/Table.razor b/src/BootstrapBlazor/Components/Table/Table.razor
index 544546b8e5320fa8142ac903ce4808137edee5ad..2ce8eb3769b042d1ef6b70837ee92d7231b3bfe2 100644
--- a/src/BootstrapBlazor/Components/Table/Table.razor
+++ b/src/BootstrapBlazor/Components/Table/Table.razor
@@ -69,7 +69,7 @@
                                 <span class="d-none d-sm-inline-block">@ColumnButtonText</span>
                                 <span class="caret"></span>
                             </button>
-                            <div class="dropdown-menu dropdown-menu-right">
+                            <div class="dropdown-menu dropdown-menu-right shadow">
                                 @foreach (var item in Columns)
                                 {
                                     var poco = ColumnVisibles.First(i => i.FieldName == item.GetFieldName());
@@ -90,7 +90,7 @@
                                 <span class="d-none d-sm-inline-block">@ExportButtonText</span>
                                 <span class="caret"></span>
                             </button>
-                            <div class="dropdown-menu dropdown-menu-right">
+                            <div class="dropdown-menu dropdown-menu-right shadow">
                                 <div class="dropdown-item">
                                     <i class="fa fa-file-text-o"></i>
                                     <span>CSV （未实现）</span>