diff --git a/docker-compose.yml b/docker-compose.yml
index ae035e1..2b94689 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -103,6 +103,7 @@ services:
       - YOUTUBE_DATA_API_KEY=${YOUTUBE_DATA_API_KEY:-}
       - INSTA_DATA_PATH=/app/data
       - CARD_TEMPLATE_DIR=/app/app/templates
+      - INSTA_DEFAULT_THEME=${INSTA_DEFAULT_THEME:-default}
       - CORS_ALLOW_ORIGINS=${CORS_ALLOW_ORIGINS:-http://localhost:3007,http://localhost:8080}
     volumes:
       - ${RUNTIME_PATH}/data/insta:/app/data
diff --git a/insta-lab/app/config.py b/insta-lab/app/config.py
index ee6f85f..a2674f9 100644
--- a/insta-lab/app/config.py
+++ b/insta-lab/app/config.py
@@ -11,6 +11,7 @@ INSTA_DATA_PATH = os.getenv("INSTA_DATA_PATH", "/app/data")
 DB_PATH = os.path.join(INSTA_DATA_PATH, "insta.db")
 CARDS_DIR = os.path.join(INSTA_DATA_PATH, "insta_cards")
 CARD_TEMPLATE_DIR = os.getenv("CARD_TEMPLATE_DIR", "/app/app/templates")
+INSTA_DEFAULT_THEME = os.getenv("INSTA_DEFAULT_THEME", "default")
 
 CORS_ALLOW_ORIGINS = os.getenv(
     "CORS_ALLOW_ORIGINS", "http://localhost:3007,http://localhost:8080"
diff --git a/insta-lab/app/main.py b/insta-lab/app/main.py
index 5f86fae..23ca0e3 100644
--- a/insta-lab/app/main.py
+++ b/insta-lab/app/main.py
@@ -14,6 +14,7 @@ from pydantic import BaseModel
 from .config import (
     CORS_ALLOW_ORIGINS, NAVER_CLIENT_ID, ANTHROPIC_API_KEY,
     INSTA_DATA_PATH, DB_PATH, DEFAULT_CATEGORY_SEEDS, KEYWORDS_PER_CATEGORY,
+    INSTA_DEFAULT_THEME,
 )
 from . import db, news_collector, keyword_extractor, card_writer, card_renderer, trend_collector
 
@@ -146,7 +147,7 @@ async def _bg_create_slate(task_id: str, keyword: str, category: str, keyword_id
         db.update_task(task_id, "processing", 30, "카피 생성 중")
         sid = card_writer.write_slate(keyword=keyword, category=category)
         db.update_task(task_id, "processing", 70, "카드 렌더 중")
-        await card_renderer.render_slate(sid)
+        await card_renderer.render_slate(sid, template=f"{INSTA_DEFAULT_THEME}/card.html.j2")
         db.update_slate_status(sid, "rendered")
         if keyword_id:
             db.mark_keyword_used(keyword_id)
@@ -186,7 +187,7 @@ def get_slate(slate_id: int):
 async def _bg_render(task_id: str, slate_id: int):
     try:
         db.update_task(task_id, "processing", 30, "재렌더 중")
-        await card_renderer.render_slate(slate_id)
+        await card_renderer.render_slate(slate_id, template=f"{INSTA_DEFAULT_THEME}/card.html.j2")
         db.update_slate_status(slate_id, "rendered")
         db.update_task(task_id, "succeeded", 100, "완료", result_id=slate_id)
     except Exception as e: