You can install OrbitCSS with NPM. This will give you all of the Sass files along with the compiled CSS.
npm install orbitcss
Use the jsDelivr CDN to include OrbitCSS directly into your project.
Compressed CSS.
https://cdn.jsdelivr.net/npm/orbitcss/css/orbit.min.css
Uncompressed CSS.
https://cdn.jsdelivr.net/npm/orbitcss/css/orbit.css
You can download the repository directly from Github.
https://github.com/OrbitCSS/orbitcss/tree/master/css
To get started right away just copy/paste the HTML template below.
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/orbitcss/css/orbit.min.css">
<title>In orbit.</title>
</head>
<body>
<p>Hello, world! I am in outer space!</p>
</body>
</html>
For OrbitCSS to work correctly you must use the HTML5 doctype <!DOCTYPE html>
and the repsonsive viewport meta tag.