diff --git a/packages/fineui/src/less/base/single/button/button.less b/packages/fineui/src/less/base/single/button/button.less
index e352d4c3c..a25690732 100644
--- a/packages/fineui/src/less/base/single/button/button.less
+++ b/packages/fineui/src/less/base/single/button/button.less
@@ -580,6 +580,10 @@ body .bi-button, #body .bi-button {
   .bi-button {
     background-color: @color-bi-background-button-theme-dark;
 
+    &.clear {
+      background-color: transparent;
+    }
+
     &.button-ignore {
       background-color: @color-bi-background-ignore-button-theme-dark;
 
diff --git a/packages/fineui/src/widget/multilayerdownlist/combo.downlist.js b/packages/fineui/src/widget/multilayerdownlist/combo.downlist.js
index 56bf41107..e5a1e464d 100644
--- a/packages/fineui/src/widget/multilayerdownlist/combo.downlist.js
+++ b/packages/fineui/src/widget/multilayerdownlist/combo.downlist.js
@@ -23,6 +23,7 @@ export class MultiLayerDownListCombo extends Widget {
             container: null,
             stopPropagation: false,
             el: {},
+            popup: {},
         });
     }
 
@@ -65,6 +66,7 @@ export class MultiLayerDownListCombo extends Widget {
                 el: this.popupview,
                 stopPropagation: o.stopPropagation,
                 maxHeight: 1000,
+                ...o.popup,
             },
         });