dabblet.css

/**
 * Blueprint background SVG
 */

min-height: 100%;
background: #004890 url('data:image/svg+xml;,<svg xmlns="http://www.w3.org/2000/svg" fill="%23fff"><pattern id="a" width="20" height="20" patternUnits="userSpaceOnUse" patternTransform="rotate(65)"><path d="M10 0v9h9v1h-9v9h-1v-9h-9v-1h9v-9" opacity=".08"/><path d="M0 19h19v-19h1v20h-20" opacity=".15"/></pattern><rect width="100%" height="100%" fill="%23004890"/><rect width="100%" height="100%" fill="url(%23a)"/></svg>');

dabblet.js

// alert('Hello world!');

settings.json

{"view":"split-vertical","fontsize":"100","seethrough":"","prefixfree":"1","page":"css"}