diff --git a/packages/theme/src/dialog-box/index.less b/packages/theme/src/dialog-box/index.less
index f3d96174b1..f1e2a3af7d 100644
--- a/packages/theme/src/dialog-box/index.less
+++ b/packages/theme/src/dialog-box/index.less
@@ -56,6 +56,7 @@
   &.is-fullscreen &__body {
     flex: 1;
     overflow: scroll;
+    max-height: 100vh;
   }
 
   & &__header {