diff --git a/css-ass/.Rhistory b/css-ass/.Rhistory
new file mode 100644
index 0000000..e69de29
diff --git a/css-ass/index.html b/css-ass/index.html
index fc12b5c..58efd8f 100644
--- a/css-ass/index.html
+++ b/css-ass/index.html
@@ -21,7 +21,7 @@ <h1>Chapters</h1>
       <div class="chapter" id="current-chapter">
         <div class="chapter-name">Ch 3. CSS: Desiging HTML</div>
         <div class="horizontal-lists">
-          Introducing CSS / Basic Structure of CSS / Selectors </ul>
+          Introducing CSS / Basic Structure of CSS / Selectors </div>
         </div><br>
 
         <div class="chapter">
@@ -32,6 +32,6 @@ <h1>Chapters</h1>
         </div>
       </div>
     </div>
-    </body>
+  </body>
 
 </html>
\ No newline at end of file
diff --git a/css-ass/style.css b/css-ass/style.css
index e69de29..20ac2f2 100644
--- a/css-ass/style.css
+++ b/css-ass/style.css
@@ -0,0 +1,22 @@
+h1{
+    text-align: center;
+}
+#box-layout{
+    padding-left: 10%;
+    padding-right: 10%;
+}
+
+#content-box{
+    background-color: greenyellow;
+}
+
+div.chapter > div.horizontal-lists{
+    color: blue;
+}
+
+div.chapter-name{
+    font-weight: bold;
+}#current-chapter{
+    color: red;
+}
+
diff --git a/js-ass/script.js b/js-ass/script.js
index 0233287..39ce09b 100644
--- a/js-ass/script.js
+++ b/js-ass/script.js
@@ -68,6 +68,18 @@ const checkGuess = () => {
   // TODO 
   // 입력값에 따라 , isLow, isHigh, Collect 등의 함수를 호출 
   // guess Count가 10이 될 경우 game over
+  if(guessCount >= 10) gameOver();
+
+  if (userGuess < randomNumber) {
+    isLow();
+  }
+  else if(userGuess > randomNumber) {
+    isHigh();
+  }
+  else {
+    collect();
+  }
+  
   guessCount++;
   guessField.value = '';
   guessField.focus();