diff --git a/packages/docusaurus-theme-classic/src/theme/Navbar/index.js b/packages/docusaurus-theme-classic/src/theme/Navbar/index.js
index d7c5d066ece2..5db5e854c625 100644
--- a/packages/docusaurus-theme-classic/src/theme/Navbar/index.js
+++ b/packages/docusaurus-theme-classic/src/theme/Navbar/index.js
@@ -49,9 +49,12 @@ function NavLink({activeBasePath, to, href, label, position, ...props}) {
   );
 }
 
-function NavItem({items, position, ...props}) {
+function NavItem({items, position, className, ...props}) {
+  const navLinkClassNames = (extraClassName) =>
+    classnames('navbar__item', 'navbar__link', extraClassName);
+
   if (!items) {
-    return <NavLink className="navbar__item navbar__link" {...props} />;
+    return <NavLink className={navLinkClassNames(className)} {...props} />;
   }
 
   return (
@@ -60,44 +63,56 @@ function NavItem({items, position, ...props}) {
         'dropdown--left': position === 'left',
         'dropdown--right': position === 'right',
       })}>
-      <NavLink className="navbar__item navbar__link" {...props}>
+      <NavLink className={navLinkClassNames(className)} {...props}>
         {props.label}
       </NavLink>
       <ul className="dropdown__menu">
-        {items.map((linkItemInner, i) => (
-          <li key={i}>
-            <NavLink className="navbar__item navbar__link" {...linkItemInner} />
-          </li>
-        ))}
+        {items.map(
+          ({className: childItemClassName, ...linkItemInnerProps}, i) => (
+            <li key={i}>
+              <NavLink
+                className={navLinkClassNames(childItemClassName)}
+                {...linkItemInnerProps}
+              />
+            </li>
+          ),
+        )}
       </ul>
     </div>
   );
 }
 
-function MobileNavItem({items, ...props}) {
+function MobileNavItem({items, className, ...props}) {
+  const navLinkClassNames = (extraClassName, isSubList = false) =>
+    classnames('menu__link', extraClassName, {
+      'menu__link--sublist': isSubList,
+    });
+
   if (!items) {
     return (
       <li className="menu__list-item">
-        <NavLink className="menu__link" {...props} />
+        <NavLink className={navLinkClassNames(className)} {...props} />
       </li>
     );
   }
 
   return (
     <li className="menu__list-item">
-      <NavLink className="menu__link menu__link--sublist" {...props}>
+      <NavLink className={navLinkClassNames(className, true)} {...props}>
         {props.label}
       </NavLink>
       <ul className="menu__list">
-        {items.map((linkItemInner, i) => (
-          <li className="menu__list-item" key={i}>
-            <NavLink
-              className="menu__link"
-              {...linkItemInner}
-              onClick={props.onClick}
-            />
-          </li>
-        ))}
+        {items.map(
+          ({className: childItemClassName, ...linkItemInnerProps}, i) => (
+            <li className="menu__list-item" key={i}>
+              <NavLink
+                className={navLinkClassNames(childItemClassName)}
+                {...linkItemInnerProps}
+                onClick={props.onClick}
+              />
+            </li>
+          ),
+        )}
       </ul>
     </li>
   );
diff --git a/website/docs/theme-classic.md b/website/docs/theme-classic.md
index c6d4ce8afbb8..a77816c8920a 100644
--- a/website/docs/theme-classic.md
+++ b/website/docs/theme-classic.md
@@ -138,6 +138,7 @@ module.exports = {
           // To apply the active class styling on all
           // routes starting with this path.
           activeBasePath: 'docs',
+          className: '', // Custom CSS class (for styling any item)
         },
         // ... other links
       ],
diff --git a/website/docusaurus.config.js b/website/docusaurus.config.js
index 1e76f8504084..bcbba5488fab 100644
--- a/website/docusaurus.config.js
+++ b/website/docusaurus.config.js
@@ -120,8 +120,8 @@ module.exports = {
         },
         {
           href: 'https://github.com/facebook/docusaurus',
-          label: 'GitHub',
           position: 'right',
+          className: 'header-github-link',
         },
       ],
     },
diff --git a/website/src/css/custom.css b/website/src/css/custom.css
index b45ea0a3a234..433ae3f52335 100644
--- a/website/src/css/custom.css
+++ b/website/src/css/custom.css
@@ -35,3 +35,21 @@ html[data-theme='dark'] .docusaurus-highlight-code-line {
 .navbar__item.dropdown > .navbar__link {
   pointer-events: none;
 }
+
+.header-github-link:hover {
+  opacity: 0.6;
+}
+
+.header-github-link:before {
+  content: '';
+  width: 24px;
+  height: 24px;
+  display: flex;
+  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12'/%3E%3C/svg%3E")
+    no-repeat;
+}
+
+html[data-theme='dark'] .header-github-link:before {
+  background: url("data:image/svg+xml,%3Csvg viewBox='0 0 24 24' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath fill='white' d='M12 .297c-6.63 0-12 5.373-12 12 0 5.303 3.438 9.8 8.205 11.385.6.113.82-.258.82-.577 0-.285-.01-1.04-.015-2.04-3.338.724-4.042-1.61-4.042-1.61C4.422 18.07 3.633 17.7 3.633 17.7c-1.087-.744.084-.729.084-.729 1.205.084 1.838 1.236 1.838 1.236 1.07 1.835 2.809 1.305 3.495.998.108-.776.417-1.305.76-1.605-2.665-.3-5.466-1.332-5.466-5.93 0-1.31.465-2.38 1.235-3.22-.135-.303-.54-1.523.105-3.176 0 0 1.005-.322 3.3 1.23.96-.267 1.98-.399 3-.405 1.02.006 2.04.138 3 .405 2.28-1.552 3.285-1.23 3.285-1.23.645 1.653.24 2.873.12 3.176.765.84 1.23 1.91 1.23 3.22 0 4.61-2.805 5.625-5.475 5.92.42.36.81 1.096.81 2.22 0 1.606-.015 2.896-.015 3.286 0 .315.21.69.825.57C20.565 22.092 24 17.592 24 12.297c0-6.627-5.373-12-12-12'/%3E%3C/svg%3E")
+    no-repeat;
+}