This project demonstrates the power of Tailwind CSS v4's container queries feature, showcasing how components can adapt based on their container's size rather than just the viewport size.

Demonstrates how a single component (ProductCard) adapts to different container sizes:

• Shows the same component in different fixed-width containers
• Visualizes breakpoint changes with dashed borders
• Helps understand container query behavior in isolation

Shows a real-world implementation combining container queries with responsive design:

• Collapsible side navigation that affects layout
• Uses named container queries (@container/page) for responsive behavior
• Collapses to icon-only view on small containers
• Full-width mobile view with smooth transitions

• Responsive grid using container queries:
  • Hidden below @[15rem]
  • Single column by default
  • 2 columns at @3xl
  • 3 columns at @5xl
  • 4 columns at @7xl
• Grid adjusts based on available space when navigation is toggled

• Uses container queries for adaptive layout:
  • Vertical layout by default (image top, content bottom)
  • Horizontal layout at @lg breakpoint (image left, content right)
• Maintains consistent spacing and proportions
• Built with shadcn/ui components for a polished look

• React 19
• Vite
• TanStack Router
• Tailwind CSS v4
• shadcn/ui
• TypeScript

<div className="@container">
  <div className="flex flex-col @lg:flex-row">
    {/* Content adapts based on container width */}
  </div>
</div>

<div className="@container/page">
  <div className="w-screen @sm/page:w-[240px]">
    {/* Content adapts based on named container */}
  </div>
</div>

<div className="grid-cols-1 
  @3xl:grid-cols-2 
  @5xl:grid-cols-3 
  @7xl:grid-cols-4">
  {/* Grid columns adapt based on container size */}
</div>

1. Clone the repository
2. Install dependencies:

   pnpm install

3. Start the development server:

   pnpm dev

4. Visit http://localhost:3000

1. Container queries are perfect for reusable components that need to adapt to their available space
2. Named container queries allow for more complex responsive patterns
3. Combining container queries with traditional responsive design creates more flexible layouts
4. Container queries work well with CSS Grid and Flexbox for dynamic layouts

To run this application:

pnpm install
pnpm start  

To build this application for production:

pnpm build

This project uses Vitest for testing. You can run the tests with:

pnpm test

This project uses Tailwind CSS for styling.

This project uses Biome for linting and formatting. The following scripts are available:

pnpm lint
pnpm format
pnpm check

Add components using the latest version of Shadcn.

pnpx shadcn@latest add button

This project uses TanStack Router. The initial setup is a file based router. Which means that the routes are managed as files in src/routes.

To add a new route to your application just add another a new file in the ./src/routes directory.

TanStack will automatically generate the content of the route file for you.

Now that you have two routes you can use a Link component to navigate between them.

To use SPA (Single Page Application) navigation you will need to import the Link component from @tanstack/react-router.

import { Link } from "@tanstack/react-router";

Then anywhere in your JSX you can use it like so:

<Link to="/about">About</Link>

This will create a link that will navigate to the /about route.

More information on the Link component can be found in the Link documentation.

In the File Based Routing setup the layout is located in src/routes/__root.tsx. Anything you add to the root route will appear in all the routes. The route content will appear in the JSX where you use the <Outlet /> component.

Here is an example layout that includes a header:

import { Outlet, createRootRoute } from '@tanstack/react-router'
import { TanStackRouterDevtools } from '@tanstack/react-router-devtools'

import { Link } from "@tanstack/react-router";

export const Route = createRootRoute({
  component: () => (
    <>
      <header>
        <nav>
          <Link to="/">Home</Link>
          <Link to="/about">About</Link>
        </nav>
      </header>
      <Outlet />
      <TanStackRouterDevtools />
    </>
  ),
})

The <TanStackRouterDevtools /> component is not required so you can remove it if you don't want it in your layout.

More information on layouts can be found in the Layouts documentation.

There are multiple ways to fetch data in your application. You can use TanStack Query to fetch data from a server. But you can also use the loader functionality built into TanStack Router to load the data for a route before it's rendered.

For example:

const peopleRoute = createRoute({
  getParentRoute: () => rootRoute,
  path: "/people",
  loader: async () => {
    const response = await fetch("https://swapi.dev/api/people");
    return response.json() as Promise<{
      results: {
        name: string;
      }[];
    }>;
  },
  component: () => {
    const data = peopleRoute.useLoaderData();
    return (
      <ul>
        {data.results.map((person) => (
          <li key={person.name}>{person.name}</li>
        ))}
      </ul>
    );
  },
});

Loaders simplify your data fetching logic dramatically. Check out more information in the Loader documentation.

React-Query is an excellent addition or alternative to route loading and integrating it into you application is a breeze.

First add your dependencies:

pnpm add @tanstack/react-query @tanstack/react-query-devtools

Next we'll need to create a query client and provider. We recommend putting those in main.tsx.

import { QueryClient, QueryClientProvider } from "@tanstack/react-query";

// ...

const queryClient = new QueryClient();

// ...

if (!rootElement.innerHTML) {
  const root = ReactDOM.createRoot(rootElement);

  root.render(
    <QueryClientProvider client={queryClient}>
      <RouterProvider router={router} />
    </QueryClientProvider>
  );
}

You can also add TanStack Query Devtools to the root route (optional).

import { ReactQueryDevtools } from "@tanstack/react-query-devtools";

const rootRoute = createRootRoute({
  component: () => (
    <>
      <Outlet />
      <ReactQueryDevtools buttonPosition="top-right" />
      <TanStackRouterDevtools />
    </>
  ),
});

Now you can use useQuery to fetch your data.

import { useQuery } from "@tanstack/react-query";

import "./App.css";

function App() {
  const { data } = useQuery({
    queryKey: ["people"],
    queryFn: () =>
      fetch("https://swapi.dev/api/people")
        .then((res) => res.json())
        .then((data) => data.results as { name: string }[]),
    initialData: [],
  });

  return (
    <div>
      <ul>
        {data.map((person) => (
          <li key={person.name}>{person.name}</li>
        ))}
      </ul>
    </div>
  );
}

export default App;

You can find out everything you need to know on how to use React-Query in the React-Query documentation.

Another common requirement for React applications is state management. There are many options for state management in React. TanStack Store provides a great starting point for your project.

First you need to add TanStack Store as a dependency:

pnpm add @tanstack/store

Now let's create a simple counter in the src/App.tsx file as a demonstration.

import { useStore } from "@tanstack/react-store";
import { Store } from "@tanstack/store";
import "./App.css";

const countStore = new Store(0);

function App() {
  const count = useStore(countStore);
  return (
    <div>
      <button onClick={() => countStore.setState((n) => n + 1)}>
        Increment - {count}
      </button>
    </div>
  );
}

export default App;

One of the many nice features of TanStack Store is the ability to derive state from other state. That derived state will update when the base state updates.

Let's check this out by doubling the count using derived state.

import { useStore } from "@tanstack/react-store";
import { Store, Derived } from "@tanstack/store";
import "./App.css";

const countStore = new Store(0);

const doubledStore = new Derived({
  fn: () => countStore.state * 2,
  deps: [countStore],
});
doubledStore.mount();

function App() {
  const count = useStore(countStore);
  const doubledCount = useStore(doubledStore);

  return (
    <div>
      <button onClick={() => countStore.setState((n) => n + 1)}>
        Increment - {count}
      </button>
      <div>Doubled - {doubledCount}</div>
    </div>
  );
}

export default App;

We use the Derived class to create a new store that is derived from another store. The Derived class has a mount method that will start the derived store updating.

Once we've created the derived store we can use it in the App component just like we would any other store using the useStore hook.

You can find out everything you need to know on how to use TanStack Store in the TanStack Store documentation.

Files prefixed with demo can be safely deleted. They are there to provide a starting point for you to play around with the features you've installed.

You can learn more about all of the offerings from TanStack in the TanStack documentation.