diff --git a/.storybook/themes/news.scss b/.storybook/themes/news.scss
index 124014a736..afac881460 100644
--- a/.storybook/themes/news.scss
+++ b/.storybook/themes/news.scss
@@ -1636,7 +1636,7 @@
 					"overflow-y": scroll,
 					"overflow-block": scroll,
 					"transform": translate(0, 0),
-					"inline-size": 100%
+					"inline-size": calc(100vh - var(--header-nav-chain-height))
 				),
 				"header-nav-chain-flyout-overlay-scrollbar": (
 					"display": none
diff --git a/blocks/header-nav-chain-block/themes/news.json b/blocks/header-nav-chain-block/themes/news.json
index 122e2422ed..f322093f67 100644
--- a/blocks/header-nav-chain-block/themes/news.json
+++ b/blocks/header-nav-chain-block/themes/news.json
@@ -335,7 +335,7 @@
 				"overflow-y": "scroll",
 				"overflow-block": "scroll",
 				"transform": "translate(0, 0)",
-				"inline-size": "100%"
+				"inline-size": "calc(100vh - var(--header-nav-chain-height))"
 			},
 			"desktop": {}
 		}