diff --git a/src/components/PreviewCard.tsx b/src/components/PreviewCard.tsx
index e38d291..30cf338 100644
--- a/src/components/PreviewCard.tsx
+++ b/src/components/PreviewCard.tsx
@@ -120,7 +120,7 @@ export function PreviewCard(props: Immutable<Props>): JSX.Element {
         {thumbnail && stackNumber > 0 && (
           <>
             <Img
-              className="opacity-30 rounded-t-md overflow-hidden absolute transition-[top_transform]
+              className="opacity-30 rounded-md overflow-hidden absolute transition-[top_transform]
                 -top-[var(--stacked-top)*1.5rem]
                 scale-[calc(1-0.15*var(--stacked-top))]"
               image={thumbnail}
@@ -128,7 +128,7 @@ export function PreviewCard(props: Immutable<Props>): JSX.Element {
             />
 
             <div
-              className="bg-light rounded-t-md overflow-hidden absolute transition-[top_transform]
+              className="bg-light rounded-md overflow-hidden absolute transition-[top_transform]
               -top-[var(--stacked-top)*0.7rem]
               scale-[calc(1-0.06*var(--stacked-top))]"
             >
diff --git a/src/pages/contents/index.tsx b/src/pages/contents/index.tsx
index 0591088..daaf74c 100644
--- a/src/pages/contents/index.tsx
+++ b/src/pages/contents/index.tsx
@@ -242,11 +242,12 @@ function getGroups(
       items.map((item) => {
         const type =
           item.attributes?.type?.data?.attributes?.titles?.[0]?.title ??
-          prettySlug(item.attributes?.type?.data?.attributes?.slug);
+          item.attributes?.type?.data?.attributes?.slug
+            ? prettySlug(item.attributes.type.data.attributes.slug)
+            : langui.no_type;
         if (!group.has(type)) group.set(type, []);
         group.get(type)?.push(item);
       });
-
       return group;
     }