{
const svg = d3.create("svg").attr("width", width).attr("height", height);
svg.append("rect").attr("width", width).attr("height", height).attr("fill", "#f0f0f0");
const circle = svg.append("circle")
.attr("r", height / 2);
circle.attr("cx", dx + height / 2)
.attr("cy", height / 2);
return svg.node();
}