diff --git a/packages/session-ui/src/components/message-part.css b/packages/session-ui/src/components/message-part.css
index 8a742d3b813..d016aac7a0a 100644
--- a/packages/session-ui/src/components/message-part.css
+++ b/packages/session-ui/src/components/message-part.css
@@ -1461,20 +1461,11 @@
 }
 
 [data-component="accordion"][data-scope="apply-patch"] {
+  /* Keep the sticky header square so its page-colored corners hide the diff scrolling under the rounded trigger. */
   [data-slot="accordion-header"] {
     background-color: var(--v2-background-bg-base);
   }
 
-  [data-slot="accordion-item"]:first-child > [data-slot="accordion-header"] {
-    border-top-left-radius: var(--radius-lg);
-    border-top-right-radius: var(--radius-lg);
-  }
-
-  [data-slot="accordion-item"]:last-child:not([data-expanded]) > [data-slot="accordion-header"] {
-    border-bottom-left-radius: var(--radius-lg);
-    border-bottom-right-radius: var(--radius-lg);
-  }
-
   [data-slot="apply-patch-trigger-content"] {
     display: flex;
     align-items: center;