diff --git a/src/style/var.less b/src/style/var.less
index 816bdb8b4..445c19258 100644
--- a/src/style/var.less
+++ b/src/style/var.less
@@ -693,7 +693,7 @@
 @toast-loading-icon-color: @white;
 @toast-line-height: 20px;
 @toast-border-radius: @border-radius-md;
-@toast-background-color: rgba(@text-color, .88);
+@toast-background-color: fade(@text-color, 88%);
 @toast-icon-size: 40px;
 @toast-text-min-width: 96px;
 @toast-text-padding: @padding-xs @padding-sm;