diff --git a/c3.js b/c3.js
index 95c873b..22fdc18 100644
--- a/c3.js
+++ b/c3.js
@@ -4660,14 +4660,14 @@
                 .attr('width', 10)
                 .attr('height', 10);
             // Set background for inset legend
-            if (isLegendInset && maxWidth != 0) {
+            if (isLegendInset && maxWidth !== 0) {
               legend.insert('g', '.' + CLASS.legendItem)
                 .attr("class", CLASS.legendBackground).append('rect')
                 .style('opacity', 0.75)
                 .style('fill', 'white')
                 .style('stroke', 'lightgray')
                 .style('stroke-width', 1)
-                .attr('height', getLegendHeight()-10)
+                .attr('height', getLegendHeight() - 10)
                 .attr('width', maxWidth);
             }