Is it possible to enlarge a StepColormap and center it within the top of a map?

[kburchfiel]

I have an existing set of code that adds a StepColormap to a Folium map. Here's what the current version of the map looks like:

However, I would now like to (1) increase the size of the colormap and (2) position it at the top center of the window. Is there a way to perform these updates within the original Python function that I used to create this map? If not, a solution that involves editing the HTML file would also be acceptable.

The map's underlying HTML code can be found here. I'm thinking that the answer might involve fiddling with the code near the end of the file that constructs the colormap:

var color_map_cefe66010de7a9e3859dee6c0ad79901 = {};

    
    color_map_cefe66010de7a9e3859dee6c0ad79901.color = d3.scale.threshold()
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'#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff', '#006837ff']);
    

    color_map_cefe66010de7a9e3859dee6c0ad79901.x = d3.scale.linear()
              .domain([-4.3691813613485975, 5.671906681304127])
              .range([0, 450 - 50]);

    color_map_cefe66010de7a9e3859dee6c0ad79901.legend = L.control({position: 'topright'});
    color_map_cefe66010de7a9e3859dee6c0ad79901.legend.onAdd = function (map) {var div = L.DomUtil.create('div', 'legend'); return div};
    color_map_cefe66010de7a9e3859dee6c0ad79901.legend.addTo(map_cfd4219cbe218c3ddbd9f1690c333306);

    color_map_cefe66010de7a9e3859dee6c0ad79901.xAxis = d3.svg.axis()
        .scale(color_map_cefe66010de7a9e3859dee6c0ad79901.x)
        .orient("top")
        .tickSize(1)
        .tickValues([-4.3691813613485975, '', -0.9231412988926668, '', -0.31107943927102405, '', 0.5086200579734276, '', 2.2004854128038907, '', 5.671906681304126, '']);

    color_map_cefe66010de7a9e3859dee6c0ad79901.svg = d3.select(".legend.leaflet-control").append("svg")
        .attr("id", 'legend')
        .attr("width", 450)
        .attr("height", 40);

    color_map_cefe66010de7a9e3859dee6c0ad79901.g = color_map_cefe66010de7a9e3859dee6c0ad79901.svg.append("g")
        .attr("class", "key")
        .attr("transform", "translate(25,16)");

    color_map_cefe66010de7a9e3859dee6c0ad79901.g.selectAll("rect")
        .data(color_map_cefe66010de7a9e3859dee6c0ad79901.color.range().map(function(d, i) {
          return {
            x0: i ? color_map_cefe66010de7a9e3859dee6c0ad79901.x(color_map_cefe66010de7a9e3859dee6c0ad79901.color.domain()[i - 1]) : color_map_cefe66010de7a9e3859dee6c0ad79901.x.range()[0],
            x1: i < color_map_cefe66010de7a9e3859dee6c0ad79901.color.domain().length ? color_map_cefe66010de7a9e3859dee6c0ad79901.x(color_map_cefe66010de7a9e3859dee6c0ad79901.color.domain()[i]) : color_map_cefe66010de7a9e3859dee6c0ad79901.x.range()[1],
            z: d
          };
        }))
      .enter().append("rect")
        .attr("height", 40 - 30)
        .attr("x", function(d) { return d.x0; })
        .attr("width", function(d) { return d.x1 - d.x0; })
        .style("fill", function(d) { return d.z; });

    color_map_cefe66010de7a9e3859dee6c0ad79901.g.call(color_map_cefe66010de7a9e3859dee6c0ad79901.xAxis).append("text")
        .attr("class", "caption")
        .attr("y", 21)
        .text("");

Thank you in advance for your assistance!