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;