center header:

src/web/src/components/header.jsx

@@ -35,6 +35,7 @@ function Header() {
   }
 
   return (
+    <div className="flex justify-center items-center">
       <div className="flex space-x-1">
         {tabs.map((tab) => (
           <Link key={tab.id} href={`/${tab.id}`} passHref>
@@ -60,6 +61,7 @@ function Header() {
           </Link>
         ))}
       </div>
+    </div>
   );
 }
 export default Header;