How to change the Background?
Zakra theme allows you to manage the Background in the site both inside and outside the container. Just follow these steps:
Go to the Appearance > Customize > Global > Background section from your WordPress Dashboard.
In the Background section, you will see two available options:
Background Color: It manages to add background color inside the container.
It is shown in the image below:

Background Image: It manages to add a background image inside the container.
It is shown in the image below:

Background Color: It manages to add background color outside the container.
It is shown in the image below:

Background Image: It manages to add a background image outside the container.
It is shown in the image below:

Click on Publish.
Go to the Appearance > Customize > Global > Background section from your WordPress Dashboard.
In the Background section, you will see two available options:
Inside Container
Background Color: It manages to add background color inside the container.
It is shown in the image below:

Background Image: It manages to add a background image inside the container.
It is shown in the image below:

Outside Container
Background Color: It manages to add background color outside the container.
It is shown in the image below:

Background Image: It manages to add a background image outside the container.
It is shown in the image below:

Click on Publish.
Updated on: 01/09/2022
Thank you!