The first commented line is your dabblet’s title

dabblet.css

/**
 * The first commented line is your dabblet’s title
 */

/*background: #f06;
background: linear-gradient(45deg, #f06, yellow);
min-height: 100%;*/
body {background: #f06;}

p.box {
   width: 300px;
   border: solid 1px white;
   padding: 20px;
}

p.box:before {
   content: "#";
   border: solid 1px white;
   padding: 2px;
   margin: 0 10px 0 0;
}

dabblet.js

// alert('Hello world!');

settings.json

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