style: 更新 Dropdown 暗黑主题背景色

Author: ArgoZhang

src/BootstrapBlazor/Components/Dropdown/Dropdown.razor.scss

@@ -0,0 +1,3 @@
+[data-bs-theme='dark'] .dropdown-menu {
+    --bs-dropdown-bg: #{$bs-dropdown-bg-dark};
+}

src/BootstrapBlazor/wwwroot/scss/bootstrapblazor-dark.scss

@@ -10,6 +10,9 @@ $bb-layout-menu-user-border-color-dark: #2c3034;
 $bb-layout-logo-border-color-dark: var(--bs-border-color);
 $bb-layout-logo-bg-dark: #606266;
 
+// Dropdown
+$bs-dropdown-bg-dark: #343a40;
+
 // Dial-Button
 $bb-dial-item-hover-bg-dark: #313131;
 

src/BootstrapBlazor/wwwroot/scss/components.scss

@@ -34,6 +34,7 @@
 @import "../../Components/Divider/Divider.razor.scss";
 @import "../../Components/DragDrap/DragDrop.razor.scss";
 @import "../../Components/Drawer/Drawer.razor.scss";
+@import "../../Components/Dropdown/Dropdown.razor.scss";
 @import "../../Components/DropdownWidget/DropdownWidget.razor.scss";
 @import "../../Components/EditorForm/EditorForm.razor.scss";
 @import "../../Components/Empty/Empty.razor.scss";