diff --git a/src/index.js b/src/index.js
index 16d4bc3..a61db48 100644
--- a/src/index.js
+++ b/src/index.js
@@ -32,7 +32,7 @@ const viewMs = 10 * 1000
 // Create ChartXY.
 const chart = lightningChart()
     .ChartXY({
-        theme: Themes[new URLSearchParams(window.location.search).get('theme') || 'darkGold'] || undefined
+        theme: Themes[new URLSearchParams(window.location.search).get('theme') || 'darkGold'] || undefined,
     })
     .setTitle('Scrolling Heatmap Spectrogram')
 chart