Custom Backgrounds is a
theme feature
that provides for customization of the background color
and image.
In the Log Lolla case this means you can set a background
image and the theme design won’t broke; however the
aesthetics will suffer for sure.
Page backgrounds are never meant to improve a site’s design.
They are an old technique which somehow survived into
WordPress theme customisation requirements.
We recommend customizing the color scheme instead and leave
the design as is without any custom background image.