Customize Theme
From Shopnix Help
What is Theme?
By using theme you can change the look of your store.
Where I will get theme feature?
Go to store manager > SETUP > THEME
There are 3 tabs i.e. Theme, Customize and Home
Now come to the Customize tab
In this section you can upload you own background image, you can set your own background color.
You can upload the image by clicking on the 
button.
If you have more queries or would like assistance with this please contact us on support@shopnix.in.