diff --git a/README.md b/README.md
index 134bcb1..1222038 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
+<br>
+<br>
+
 # STEAMO PROJECT
 
 ## Select your language
diff --git a/_css/light.css b/_css/light.css
new file mode 100644
index 0000000..89184f5
--- /dev/null
+++ b/_css/light.css
@@ -0,0 +1,117 @@
+@media only screen and (max-width: 1299px) {
+  aside.toc-nav {
+    max-width: 45px;
+    opacity: 0.6;
+    right: 0 !important;
+    margin-right: 0 !important;
+    background: #fff;
+  }
+  aside.toc-nav:hover {
+    max-width: inherit;
+    opacity: 1;
+  }
+}
+
+@media only screen and (min-width: 1300px) {
+  section.content {
+    padding-right: 250px;
+  }
+}
+
+@media only screen and (max-width: 960px) {
+  aside.toc-nav {
+    display: none;
+  }
+}
+
+aside.toc-nav {
+  position: fixed;
+  top: 70px;
+  right: 3%;
+  margin-right: 20px;
+  width: 250px;
+  z-index: 999999;
+  align-self: flex-start;
+  flex: 0 0 auto;
+  overflow-y: auto;
+  max-height: 70%;
+}
+
+aside.toc-nav.nothing {
+  width: 0;
+}
+
+.page_toc {
+  position: relative;
+  left: 0;
+  margin: 10px 0;
+  border: none;
+  font-size: 1.0em;
+}
+
+.page_toc p.title {
+  margin: 0;
+  padding-bottom: 5px;
+  font-weight: 600;
+  font-size: 1.2em;
+}
+
+.page_toc .anchor:hover:after {
+  content: "";
+}
+.page_toc div[class^="lv"] a:hover span {
+  color: var(--sidebar-nav-link-color--active, #42b983);
+}
+
+.page_toc div {
+  border-left: 2px solid #e8e8e8;
+  text-indent: 10px;
+  padding: 2px 0;
+  cursor: pointer;
+}
+
+.page_toc div.active {
+  border-left-color: var(--sidebar-nav-link-color--active, #42b983);
+  transition: border-left-color 0.23s;
+}
+
+.page_toc div.active a span {
+  color: var(--sidebar-nav-link-color--active, #42b983);
+  transition: color 0.23s;
+}
+
+.page_toc div[class^="lv"] a {
+  color: var(--text-color-base, black);
+  text-decoration: none;
+  font-weight: 300;
+  line-height: 2em;
+  display: block;
+}
+
+.page_toc div[class^="lv"] a span {
+  color: var(--sidebar-nav-link-color--hover, var(--sidebar-nav-link-color));
+  display: block;
+  overflow: hidden;
+  white-space: nowrap;
+  text-overflow:ellipsis;
+}
+
+.page_toc div.lv2 {
+  text-indent: 20px;
+}
+
+.page_toc div.lv3 {
+  text-indent: 30px;
+}
+
+.page_toc div.lv4 {
+  text-indent: 40px;
+}
+
+.page_toc div.lv5 {
+  text-indent: 50px;
+}
+
+.page_toc div.lv6 {
+  text-indent: 60px;
+}
diff --git a/_media/BUYNOW.png b/_media/buynow.png
similarity index 100%
rename from _media/BUYNOW.png
rename to _media/buynow.png
diff --git a/_navbar.md b/_navbar.md
index 3b32413..df57d8c 100644
--- a/_navbar.md
+++ b/_navbar.md
@@ -1,6 +1,6 @@
 * <img src="https://raw.githubusercontent.com/FortAwesome/Font-Awesome/6.x/svgs/solid/language.svg" width="30" height="30">
 
-  * [English](#/en/)
-  * [Tieng Viet](#/vi/)
+  * [English](en/)
+  * [Tieng Viet](vi/)
 
 * <img src="https://raw.githubusercontent.com/FortAwesome/Font-Awesome/6.x/svgs/brands/github.svg" width="25" height="25">
diff --git a/index.html b/index.html
index c3b540c..15e1783 100644
--- a/index.html
+++ b/index.html
@@ -11,7 +11,7 @@
     <meta name="description" content="Description">
     <meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0">
     <link rel="stylesheet" href="//cdn.jsdelivr.net/npm/docsify@4/lib/themes/vue.css">
-    <link rel="stylesheet" href="https://unpkg.com/docsify-plugin-toc@1.3.1/dist/light.css">
+    <link rel="stylesheet" href="/_css/light.css">
     <link rel="stylesheet" href="//cdn.jsdelivr.net/npm/docsify-sidebar-collapse/dist/sidebar.min.css" />
     <link rel="stylesheet" href="//unpkg.com/@fortawesome/fontawesome-free/css/fontawesome.css" />
     <link rel="stylesheet" href="//unpkg.com/@fortawesome/fontawesome-free/css/brands.css" />
@@ -23,10 +23,23 @@
       :root {
         --docsifytabs-border-color: #ededed;
         --docsifytabs-tab-highlight-color: #42b983;
-
+	}
         .blue {
           color: blue;
         }
+	.sidebar-toggle {
+	background-color: unset;
+	position: fixed !important;
+	top: 0 !important;
+	bottom: auto !important;
+	padding: 10px 10px 10px 10px !important;
+}
+
+@media screen and (max-width: 768px) {
+	.markdown-section {
+		padding: 16px 16px 16px 36px !important;
+	}
+}
     </style>
     <div id="app"></div>
     <script>