diff --git a/app/src/assets/scss/protyle/_wysiwyg.scss b/app/src/assets/scss/protyle/_wysiwyg.scss
index 3f1238efe..ed6c6212f 100644
--- a/app/src/assets/scss/protyle/_wysiwyg.scss
+++ b/app/src/assets/scss/protyle/_wysiwyg.scss
@@ -264,6 +264,7 @@
       thead {
         position: sticky;
         top: -1px;
+        box-shadow: 0px -1px 0px var(--b3-theme-on-surface-light) inset;
       }
     }