diff --git a/website/src/components/SidebarAd/index.js b/website/src/components/SidebarAd/index.js
index fe0a44d2..ba38ef30 100644
--- a/website/src/components/SidebarAd/index.js
+++ b/website/src/components/SidebarAd/index.js
@@ -1,5 +1,4 @@
 import React from 'react';
-import ReactDOM from 'react-dom';
 import BrowserOnly from '@docusaurus/BrowserOnly';
 
 import clsx from 'clsx';
diff --git a/website/src/css/custom.css b/website/src/css/custom.css
index 6791f47c..b19942f0 100755
--- a/website/src/css/custom.css
+++ b/website/src/css/custom.css
@@ -159,3 +159,65 @@ html[data-theme='dark'] .navbar-icon-telegram:before {
   height: 28px;
   width: 24px;
 }
+
+#carbonads * {
+  margin: initial;
+  padding: initial;
+}
+#carbonads {
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
+    Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', Helvetica, Arial,
+    sans-serif;
+}
+#carbonads {
+  display: flex;
+  max-width: 330px;
+  background-color: hsl(0, 0%, 98%);
+  box-shadow: 0 1px 4px 1px hsla(0, 0%, 0%, 0.1);
+  z-index: 100;
+}
+#carbonads a {
+  color: inherit;
+  text-decoration: none;
+}
+#carbonads a:hover {
+  color: inherit;
+}
+#carbonads span {
+  position: relative;
+  display: block;
+  overflow: hidden;
+}
+#carbonads .carbon-wrap {
+  display: flex;
+}
+#carbonads .carbon-img {
+  display: block;
+  margin: 0;
+  line-height: 1;
+}
+#carbonads .carbon-img img {
+  display: block;
+}
+#carbonads .carbon-text {
+  font-size: 13px;
+  padding: 10px;
+  margin-bottom: 16px;
+  line-height: 1.5;
+  text-align: left;
+}
+#carbonads .carbon-poweredby {
+  display: block;
+  padding: 6px 8px;
+  background: #f1f1f2;
+  text-align: center;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+  font-weight: 600;
+  font-size: 8px;
+  line-height: 1;
+  border-top-left-radius: 3px;
+  position: absolute;
+  bottom: 0;
+  right: 0;
+}
diff --git a/website/src/theme/DocItem/index.js b/website/src/theme/DocItem/index.js
index d0f7e619..10148ec3 100644
--- a/website/src/theme/DocItem/index.js
+++ b/website/src/theme/DocItem/index.js
@@ -78,7 +78,14 @@ export default function DocItem(props) {
                     <Heading as="h1">{title}</Heading>
                   </header>
                 )}
-
+                <div className="margin--md">
+                  <script
+                    async
+                    type="text/javascript"
+                    src="//cdn.carbonads.com/carbon.js?serve=CEAI4537&placement=wwwtechinterviewhandbookorg"
+                    id="_carbonads_js"
+                  />
+                </div>
                 <DocItemFooter {...props} />
                 <br />
                 <DocContent />