backgroundpanel

noun
UK /ˈbæk.ɡraʊnd ˌpæn.əl/
US /ˈbæk.ɡraʊnd ˌpæn.əl/

A flat piece that sits behind something to make it look nicer or to show where it is.

The teacher put a blue background panel behind the class display.


OTHER MEANINGS

2. A flat board placed behind a stage or set to create a scene.

The crew painted a forest on the background panel for the school play.

3. A section of a computer screen or app that sits behind the main content.

You can change the background panel color in the settings menu.

4. A decorative board fixed behind a shelf or fireplace.

They added a wooden background panel behind the bookshelf.