chart = {
const width = 600;
const height = (width * path.bounds(plz)[1][1]) / path.bounds(plz)[1][0];
const svg = d3
.create("svg")
.attr("viewBox", path.bounds(plz).flat())
.style("background", "lightgrey");
svg
.append("g")
.selectAll("path")
.data(plz.features)
.join("path")
.attr("d", path)
.attr("stroke", "black")
.attr("fill", "none");
return svg.node();
}