diff --git a/assets/images/background1.png b/assets/images/background1.png
new file mode 100644
index 0000000..adb606a
Binary files /dev/null and b/assets/images/background1.png differ
diff --git a/assets/images/background2.png b/assets/images/background2.png
new file mode 100644
index 0000000..3ffc458
Binary files /dev/null and b/assets/images/background2.png differ
diff --git a/assets/images/background3.png b/assets/images/background3.png
new file mode 100644
index 0000000..165f03f
Binary files /dev/null and b/assets/images/background3.png differ
diff --git a/assets/videos/basic_cut.mp4 b/assets/videos/basic_cut.mp4
deleted file mode 100644
index b325009..0000000
Binary files a/assets/videos/basic_cut.mp4 and /dev/null differ
diff --git a/assets/videos/cold_img.mp4 b/assets/videos/cold_img.mp4
new file mode 100644
index 0000000..21a72ba
Binary files /dev/null and b/assets/videos/cold_img.mp4 differ
diff --git a/assets/videos/joy_img.mp4 b/assets/videos/joy_img.mp4
new file mode 100644
index 0000000..76198aa
Binary files /dev/null and b/assets/videos/joy_img.mp4 differ
diff --git a/assets/videos/know_img.mp4 b/assets/videos/know_img.mp4
new file mode 100644
index 0000000..560c019
Binary files /dev/null and b/assets/videos/know_img.mp4 differ
diff --git a/assets/videos/thirst_img.mp4 b/assets/videos/thirst_img.mp4
new file mode 100644
index 0000000..796c6e0
Binary files /dev/null and b/assets/videos/thirst_img.mp4 differ
diff --git a/lib/main.dart b/lib/main.dart
index 477449f..49f8df1 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -144,7 +144,7 @@ class _SmartGardenScreenState extends State<SmartGardenScreen> {
         body: Container(
           decoration: BoxDecoration(
             image: DecorationImage(
-              image: AssetImage('assets/images/background.png'),
+              image: AssetImage('assets/images/background1.png'),
               fit: BoxFit.cover,
             ),
           ),
@@ -271,10 +271,11 @@ class _SmartGardenScreenState extends State<SmartGardenScreen> {
                               width: 48,
                               height: 48,
                               decoration: BoxDecoration(
-                                borderRadius: BorderRadius.circular(12),
+                                color: Color(0xFFC8E6C9),  // ← 연한 초록 배경 추가
+                                borderRadius: BorderRadius.circular(24),
                               ),
                               child: ClipRRect(
-                                borderRadius: BorderRadius.circular(12),
+                                borderRadius: BorderRadius.circular(24),
                                 child: Image.asset(
                                   'assets/images/profile.png',
                                   fit: BoxFit.cover,
@@ -288,7 +289,7 @@ class _SmartGardenScreenState extends State<SmartGardenScreen> {
                                 const Text(
                                   '푸미',
                                   style: TextStyle(
-                                    fontSize: 20,  // 16 → 18
+                                    fontSize: 20,
                                     fontWeight: FontWeight.w600,
                                     color: Color(0xFF212121),
                                   ),
@@ -296,7 +297,7 @@ class _SmartGardenScreenState extends State<SmartGardenScreen> {
                                 Text(
                                   '스마트가든 AI 가이드',
                                   style: TextStyle(
-                                    fontSize: 18,  // 12 → 14
+                                    fontSize: 14,
                                     color: Color(0xFF757575),
                                   ),
                                 ),
@@ -628,20 +629,21 @@ class _ChatBubble extends StatelessWidget {
         children: [
           if (!message.isUser) ...[
             Container(
-              width: 40,  // 32 → 40
-              height: 40,  // 32 → 40
+              width: 40,
+              height: 40,
               decoration: BoxDecoration(
-                borderRadius: BorderRadius.circular(8),
+                color: Color(0xFFC8E6C9),  // ← 연한 초록 배경
+                borderRadius: BorderRadius.circular(20),  // ← 원형 (8 → 20)
               ),
               child: ClipRRect(
-                borderRadius: BorderRadius.circular(8),
+                borderRadius: BorderRadius.circular(20),  // ← 원형 (8 → 20)
                 child: Image.asset(
                   'assets/images/profile.png',
                   fit: BoxFit.cover,
                 ),
               ),
             ),
-            const SizedBox(width: 10),  // 8 → 10
+            const SizedBox(width: 10),
           ],
           Flexible(
             child: Container(
@@ -651,16 +653,23 @@ class _ChatBubble extends StatelessWidget {
               ),
               decoration: BoxDecoration(
                 color: message.isUser
-                    ? Color(0xFFBBDEFB)
-                    : Color(0xFFEEEEEE),
+                    ? Color(0xFFE8F5E9)  // ← 연한 녹색
+                    : Colors.white,     // ← 하얀색
                 borderRadius: BorderRadius.circular(8),
+                boxShadow: [
+                  BoxShadow(
+                    color: Colors.black.withOpacity(0.1),  // ← 연한 그림자
+                    blurRadius: 4,
+                    offset: const Offset(0, 2),
+                  ),
+                ],
               ),
               child: SelectableText(
                 message.text,
                 style: TextStyle(
                   fontSize: 20,
                   color: message.isUser
-                      ? Color(0xFF1976D2)
+                      ? Color(0xFF000000)  // ← 진한 초록 텍스트
                       : Color(0xFF424242),
                   height: 1.4,
                 ),
diff --git a/pubspec.yaml b/pubspec.yaml
index 642c98d..659a2d6 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -68,12 +68,19 @@ flutter:
     - assets/videos/thinking.mp4
     - assets/videos/thirst.mp4
 
-    - assets/videos/basic_img.mp4
     - assets/videos/angry_img.mp4
+    - assets/videos/basic_img.mp4
+    - assets/videos/cold_img.mp4
+    - assets/videos/joy_img.mp4
+    - assets/videos/know_img.mp4
     - assets/videos/thinking_img.mp4
+    - assets/videos/thirst_img.mp4
 
     - assets/images/profile.png
     - assets/images/background.png
+    - assets/images/background1.png
+    - assets/images/background2.png
+    - assets/images/background3.png
 
       # To add assets to your application, add an assets section, like this:
   # assets: