diff --git a/packages/client/src/tiptap/core/styles/kityminder.scss b/packages/client/src/tiptap/core/styles/kityminder.scss
index 9589ab64..b9908e20 100644
--- a/packages/client/src/tiptap/core/styles/kityminder.scss
+++ b/packages/client/src/tiptap/core/styles/kityminder.scss
@@ -97,6 +97,7 @@
   position: relative;
   z-index: 2;
   overflow: hidden;
+  background-color: var(--semi-color-bg-3) !important;
 }
 
 .km-editor > .mask {