Design/Customizing the theme background
From Shopnix Help
What is theme customization ?
Theme cutomization option lets you add edit existing images and colors of the applied theme.
Where to set this feature ?
Go to Store Manager > Setup > Theme, there you will find a tab called Global like below
Here you can apply back ground colors to your theme as weel as can upload an image for the same.
In-order to change the background color click on the Theme Background Color option like below
If you have more queries or would like assistance with this please contact us on support@shopnix.in.