diff --git a/packages/frontend/src/components/MkMediaList.vue b/packages/frontend/src/components/MkMediaList.vue
index 1c4c3d0d37..bca56ed23d 100644
--- a/packages/frontend/src/components/MkMediaList.vue
+++ b/packages/frontend/src/components/MkMediaList.vue
@@ -194,7 +194,11 @@ const previewable = (file: misskey.entities.DriveFile): boolean => {
 
 		&.n1expand {
 			min-height: 64px;
-			max-height: clamp(64px, calc(var(--containerHeight, 100svh) * 0.5), min(334px, 50vh));
+			max-height: clamp(
+				64px,
+				calc(var(--containerHeight, 100svh) * 0.5), // but --containerHeight can broken (too big)
+				min(334px, 50vh)
+			);
 		}
 
 		&.n116_9 {