          .attr("fill", maincolor)
          .style("font-size", "18px")
 
+    # black border
+    svg.append("rect").attr("class", "probe_data")
+       .attr("x", left[1])
+       .attr("y", top[1])
+       .attr("height", h[1])
+       .attr("width", w[1])
+       .attr("class", "outerBox")
+
+
   # circles at eQTL peaks
   peaks = svg.append("g").attr("id", "peaks")
              .selectAll("empty")

            .attr("class", "thickline")
            .attr("stroke", "darkslateblue")
            .style("pointer-events", "none")

    # title
    titletext = probe_data.probe

  # colors definitions
  lightGray = d3.rgb(230, 230, 230)
  darkGray = d3.rgb(200, 200, 200)
  pink = "hotpink" # "#E9CFEC"
  purple = "#8C4374"
  # bgcolor = "black"
  labelcolor = "black"   # "white"
