1. In the website builder, click on the section you want to edit, and select Change background.
2. In the Background tab, toggle the switch under Overlay opacity until you're happy with how dark or light your section's background is.
Note: The overlay opacity can only be customized if the section background is set as an image.
3. Your changes are saved automatically, but don't forget to update your website for your changes to appear in the live version of your website.