I would like to have custom backgrounds that can be seen through the forum for a certain forum.
Like the below image:

So should be easy enough to do, you can add something like htis in extra.css:

.nodeList.sectionMain .node_1 .nodeList {
  background: url(@imagePath/xenforo/sources/node1bg.png) no-repeat top center;
.nodeList.sectionMain .node_1 .nodeList .nodeInfo {
  background-color: transparent !important;

This would make it so you add an image to just the background of the nodes under the category bar, then set a transparent background on the nodes themselves so you can see behind them.

Kind of confusing possibly... let me know :D
You could make the background color of: Style Properties -> General -> Content slight opaque using the color picker (opacity is the bottom right)

Then set a background on Style Properties -> General -> Html or Body

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