The css files in this directory are sample layouts that you can use to get started with your own theme based on Kirby. They're great for cutting and pasting directly into your own modified Theme's stylesheet for a basic structural starting point OR importing into the stylesheet of a new Kirby Child Theme, like so:

/* Import a 3-column layout where the content is down the center. Kaboom! */
@import url('../kirby/layouts/3c-b.css');

Have fun!
