<!DOCTYPE html>
<meta charset="utf-8">
<style>
rect{
}
</style>
<body>
<svg width="960" height="600"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="//vizjs.org/viz.v1.1.7.min.js"></script>
<script>
var data=[['A', 1],['A', 3],['B', 3],['C', -3],['D', 8]];
var bar=viz.bar().data(data)
.fill(function(d){ return d.value < 0 ? '#FF7043': '#42A5F5';});
var svg = d3.select("svg")
.append("g")
.attr("transform","translate(50,50)")
.call(bar);
</script>