Objects that should have their content behind other objects appear on top.
For example, I used one of the starter blog archive templates to create a layout. The default section background color appears behind the contained elements as it should, but when I check advanced, and add a background color or image it covers everything inside the section. This is happening within rows and columns as well.
I noticed a z-index of either 1 or auto being added to the containers and the x-bg upper and lower elements. I’m wondering if explicitly setting values is causing an issue. Everything behaved fine before. I only ever needed to look at the z-index on things in the past if I was trying to get a particular effect.
With values explicitly declared, anything I do behaves in unexpected ways in relation to the other elements of the page. The problem with the backgrounds of container elements appearing on top of what they contain is happening before I try any custom changes.