Update viewer.js

viewer.js

@@ -95,7 +95,7 @@ export async function initializeViewer(config, instanceId) {
   const cameraYPhone = (config.cameraYPhone !== undefined) ? parseFloat(config.cameraYPhone) : cameraY;
   const cameraZPhone = (config.cameraZPhone !== undefined) ? parseFloat(config.cameraZPhone) : (cameraZ * 1.5);
 
-  color_bg_hex = (config.color_background !== undefined) ? config.color_background : "#A1D4D2";
+  color_bg_hex = (config.canvas_background !== undefined) ? config.canvas_background : "#A1D4D2";
   color_bg = hexToRgbaArray(color_bg_hex);
 
   console.log("color bg : ", color_bg);