Adjust card width on desktop

The card width was too wide on desktop. Adjusted the width to be slightly smaller than the four icon area at the bottom.

src/components/NavBar.tsx

@@ -29,7 +29,7 @@ const NavBar = () => {
   
   return (
     <div className="fixed bottom-0 left-0 right-0 p-4 z-10 animate-slide-up">
-      <div className="neuro-flat mx-auto max-w-md flex justify-around items-center py-3 px-6">
+      <div className="neuro-flat mx-auto max-w-[500px] flex justify-around items-center py-3 px-6">
         {navItems.map((item) => {
           return (
             <button