Download the example:

curl https://codeload.github.com/zeit/next.js/tar.gz/master | tar -xz next.js-master/examples/basic-css
cd next.js-master/examples/basic-css

or clone the repo:

git clone git@github.com:zeit/next.js.git --depth=1
cd next.js/examples/basic-css

Install the dependencies:

npm install

Run the dev server:

npm run dev

Next.js ships with styled-jsx allowing you to write scope styled components with full css support. This is important for the modularity and code size of your bundles and also for the learning curve of the framework. If you know css you can write styled-jsx right away.