Scrolling D3.js histogram

I have a simple bar chart:

var margin = {top: 20, right: 20, bottom: 30, left: 50};
var xLPU=d3.scale.ordinal();
var yLPU=d3.scale.linear();
var xLPUAxis = d3.svg.axis()
    .scale(xLPU)
    .orient("bottom");

var yLPUAxis = d3.svg.axis()
    .scale(yLPU)
    .orient("left")
    .ticks(10, ".");
var LPUdivision=d3.select("#LPUgraph").append("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)
  .append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
d3.json("LPUdivision.json",function(data){
    xLPU.domain(data.map(function(d){return d.lpu;}))
    .rangeBands([0, width]);
    yLPU.domain([0,d3.max(data, function(d) { return d.amount; })])
    .range([height,0]);
    LPUdivision.append("g")
    .attr("class","x axis")
    .attr("transform", "translate(0," + height + ")")
    .call(xLPUAxis);
    LPUdivision.append("g")
      .attr("class", "y axis")
      .call(yLPUAxis)
      .append("text")
      .attr("transform", "rotate(-90)")
      .attr("y", 6)
      .attr("dy", ".71em")
      .style("text-anchor", "end")
      .text(" ");
    LPUdivision.selectAll(".bar")
    .data(data)
    .enter()
    .append("rect")
    .attr("class","bar")
    .attr("x",function(d){return xLPU(d.lpu)})
    .attr("width", xLPU.rangeBand()-5)
    .attr("y", function(d) { return yLPU(d.amount); })
    .attr("height", function(d) { return height - yLPU(d.amount); })
    .attr("fill","steelblue");

});

      

        
        
        
      

    

LPUdivision.json

[
{"lpu":"lpu1","amount":"20"},
{"lpu":"lpu2","amount":"40"},
{"lpu":"lpu3","amount":"60"},
{"lpu":"lpu4","amount":"10"},
{"lpu":"lpu5","amount":"80"},
{"lpu":"lpu6","amount":"30"},
{"lpu":"lpu7","amount":"20"},
{"lpu":"lpu8","amount":"40"},
{"lpu":"lpu9","amount":"60"},
{"lpu":"lpu10","amount":"10"},
{"lpu":"lpu11","amount":"80"},
{"lpu":"lpu12","amount":"30"},
{"lpu":"lpu13","amount":"20"},
{"lpu":"lpu14","amount":"40"},
{"lpu":"lpu15","amount":"60"},
{"lpu":"lpu16","amount":"10"},
{"lpu":"lpu17","amount":"80"},
{"lpu":"lpu18","amount":"30"}
]

      

        
        
        
      

    

Here is the graphical output: Lpu Graph As you can see this is a messy lot. I need all the lpu shortcuts to display. So I suppose there must be some kind of scrollbar, but I haven't found a good example with a scrollbar in the graph. Any tips? Here is the fiddle