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dabblet.css

body
{
position: relative;
margin: 100px;
height: 300px;
border: 1px solid green;
}
div
{
background: red;
position: absolute;
top: 0;
left: 0;
width: 200px;
line-height: 40px;
-webkit-transform: rotate(-45deg);
-webkit-transform-origin: 50% 50%;
}

dabblet.html

<div>Ribbon</div>

settings.json

{"view":"split","prefixfree":"1","page":"css"}