see image
I tried to adapt here in the responsive part the same colours like in legacy. (Normally this is changed)
You can change colours of backgrounds, borders and fonts in the settings! For the nice responsive table, you need to adapt the settings for the layout. See the help!
I tried to find the same old legacy colours for the Lists and Detail Views: here they are
But the mouse_over and the featured colours don't work in JEM 2.3.0, when first and second raw is filled