Example de layout fluide

le css
<code css>
.span-1  { width:6.25%;   }
.span-2  { width:14.583%; }
.span-3  { width:22.917%; }
.span-4  { width:31.25%;  }
.span-5  { width:41.667%; }
.span-6  { width:47.917%; }
.span-7  { width:56.25%;  }
.span-8  { width:64.583%; }
.span-9  { width:72.917%; }
.span-10 { width:81.25%;  }
.span-11 { width:89.583%; }
.span-12 { width:97.917%; }

.column {
	float: left;
	margin: 0 1.04%;
}

.row {
	width: 97.875%;
	min-width: 960px;
	margin: 0 1.064%;
}

.row .row {
	display: inline-block;
	margin: 0 -1.064%;
}
</code>

le html
<code html>
<div class="row">
	<div class="column span-12">
		<div class="row">
			<div class="column span-6">3</div>
			<div class="column span-6">3</div>
		</div>
	</div>
</div>
</code>