Untitled

dabblet.css

.fbox {
	white-space: nowrap;
	width: 400px;
	border: 1px solid black;
	padding-right: 60px;
}
.fbox div {
	display: inline-block;
	background: red;
	position:relative;
}
.c1 { width: 60%; }
.c2 { width: 60px; }
.c3 { width: 40%;  }

dabblet.html

<div class="fbox">
<div class="c1">1</div><div class="c2">2</div><div class="c3">3</div>
</div>

final

settings.json

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