diff --git a/src/components/TankRenderer/FishTankPreview.tsx b/src/components/TankRenderer/FishTankPreview.tsx
index 16a104e..bb04ccb 100644
--- a/src/components/TankRenderer/FishTankPreview.tsx
+++ b/src/components/TankRenderer/FishTankPreview.tsx
@@ -39,10 +39,10 @@ export default function FishTank({
       )}
 
       {/* 배경 이미지가 없을 때 → 기본 하늘색 배경 */}
-      {!bgImage && <div className="pointer-events-none absolute inset-0 z-0" />}
+      {!bgImage && <div className="pointer-events-none absolute inset-0 z-0 bg-sky-200" />}
 
       {/* 좌상단 Repository 이름 */}
-      <div className="pointer-events-none absolute top-2 left-2 z-20 rounded px-3 text-4xl font-medium text-black">
+      <div className="pointer-events-none absolute top-2 left-2 z-20 rounded px-2 py-1 text-xl font-medium text-black">
         {repositoryName}
       </div>