diff --git a/packages/edit-post/src/components/secondary-sidebar/style.scss b/packages/edit-post/src/components/secondary-sidebar/style.scss
index d5ef3212bcfdd..122d2ec3c9c52 100644
--- a/packages/edit-post/src/components/secondary-sidebar/style.scss
+++ b/packages/edit-post/src/components/secondary-sidebar/style.scss
@@ -35,11 +35,12 @@
 
 		.edit-post-sidebar__panel-tab {
 			width: 50%;
+			margin-bottom: -$border-width;
 		}
 	}
 
 	.components-tab-panel__tab-content {
-		height: calc(100% - #{$grid-unit-60});
+		height: calc(100% - #{$grid-unit-60 - $border-width});
 	}
 }