diff --git a/src/number-keyboard/index.less b/src/number-keyboard/index.less
index 39a6c51b7..a6dcb5805 100644
--- a/src/number-keyboard/index.less
+++ b/src/number-keyboard/index.less
@@ -6,7 +6,8 @@
   left: 0;
   z-index: @number-keyboard-z-index;
   width: 100%;
-  padding-bottom: @number-keyboard-safe-area-inset-bottom;
+  padding-bottom: constant(safe-area-inset-bottom);
+  padding-bottom: env(safe-area-inset-bottom);
   background-color: @number-keyboard-background-color;
   user-select: none;
 
diff --git a/src/style/var.less b/src/style/var.less
index d239d5fcd..9c707d039 100644
--- a/src/style/var.less
+++ b/src/style/var.less
@@ -498,7 +498,6 @@
 @number-keyboard-cursor-height: 40%;
 @number-keyboard-cursor-animation-duration: 1s;
 @number-keyboard-z-index: 100;
-@number-keyboard-safe-area-inset-bottom: 32px;
 
 // Overlay
 @overlay-z-index: 1;