diff --git a/assets/css/main.css b/assets/css/main.css
index bedfa06..623d936 100644
--- a/assets/css/main.css
+++ b/assets/css/main.css
@@ -884,4 +884,68 @@ header__navbar-icon-link:hover {
     line-height: 38px;
     color: var(--text-color);
     display: block;
+}
+
+/* App container */
+.app__container {
+    background-color: #f5f5f5;
+}
+
+.category {
+    border-radius: 2px;
+    background-color: var(--white-color);
+}
+
+.category__heading {
+    color: var(--text-color);
+    font-size: 1.7rem;
+    padding: 12px 16px;
+    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
+}
+
+.category__heading-icon {
+    font-size: 1.4rem;
+    margin-right: 4px;
+    position: relative;
+    top: -1px;
+}
+
+.category-list {
+    padding: 0 0 8px 0;
+    list-style: none;
+    margin-left: 10px;
+}
+
+.category-item {
+
+}
+
+.category-item--active .category-item__link {
+    color: var(--primary-color);
+}
+
+.category-item--active .category-item__link::before {
+    content: "";
+    position: absolute;
+    top: 50%;
+    left: 6px;
+    border: 4px solid;
+    transform: translateY(-50%);
+    border-color: transparent transparent transparent var(--primary-color);
+}
+
+.category-item__link {
+    position: relative;
+    right: 0;
+    font-size: 1.5rem;
+    color: var(--text-color);
+    text-decoration: none;
+    padding: 4px 16px;
+    display: block;
+    transition: right linear 0.1s;
+}
+
+.category-item__link:hover {
+    right: -4px;
+    color: var(--primary-color);
 }
\ No newline at end of file
diff --git a/index.html b/index.html
index c12aa74..cfc4b44 100644
--- a/index.html
+++ b/index.html
@@ -306,24 +306,24 @@ <h5 class="header__cart-item-name">
             </div>
         </header>
 
-        <div class="container">
+        <div class="app__container">
             <div class="grid">
                 <div class="grid__row">
                     <div class="grid__column-2">
                         <nav class="category">
                             <h3 class="category__heading">
-                                <i class="fa-solid fa-list"></i>
+                                <i class="category__heading-icon fa-solid fa-list"></i>
                                 Danh mục
                             </h3>
                             <ul class="category-list">
                                 <li class="category-item category-item--active">
-                                    <a href="#" class="category-item-link">Kamen Rider Build</a>
+                                    <a href="#" class="category-item__link">Fullbottle</a>
                                 </li>
-                                <li class="category-item category-item--active">
-                                    <a href="#" class="category-item-link">Ohsama Sentai King-Ohger</a>
+                                <li class="category-item">
+                                    <a href="#" class="category-item__link">Shugod Soul</a>
                                 </li>
-                                <li class="category-item category-item--active">
-                                    <a href="#" class="category-item-link">Kamen Rider Gotchard</a>
+                                <li class="category-item">
+                                    <a href="#" class="category-item__link">Ride Chemy Card</a>
                                 </li>
                             </ul>
                         </nav>