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dabblet.css

html {
	background: green;
	height: 100%;
}

body {
	background: red;	
	margin: 0px;
	height: 100%;
}

.layout {
	border-collapse: collapse;
}

.layout tr {
	height: 100%;
}

.column1 {
	background: linen;	
	width: 100px;	
	vertical-align: top;
}

.column2 {
	background: pink;
	width: 500px;	
	vertical-align: top;
}

dabblet.html

<table class="layout">
   <tbody>
   	<tr>
   	   <td class="column1">
   	   	FIRST COLUMN
   	   </td>
   	   <td class="column2">
   	   	SECOND COLUMN
   	   </td>
   	</tr>
   </tbody>
</table>

settings.json

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