Terminal/Editor focus or EditorSplit/EditorSplit focus isn't visually clear/distinct

[bew]

~(for vscode only)~ For vscode & neovim

Problem

Terminal/Editor focus: When the terminal is opened, and I move the focus to the active editor above (using workbench.action.focusActiveEditorGroup): -> It ISN'T clear visually that the focus is not on the terminal anymore..

EditorGroup/EditorGroup focus: (vscode) When an EditorGroup is focused, and I move to another EditorGroup (another split): -> It ISN'T clear visually that the focus has moved..

Wanted solution

IDEAS:

• (slightly) change the background color (non-focused areas could be darker?)