Find I3 Window Class

1. Open the application.
2. Open a terminal.
3. type the command xprop.
4. Move crosshairs on the application's window and select.
5. Get the window class from the WM_CLASS(STRING) property.
6. Update ~/.i3/config
7. Restart i3: $MOD-SHIFT-r

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Reference: - How to find application's window class in i3 window manager - [I3 Reference Guide](https://i3wm.org/docs/userguide.html#_restarting_i3_inplace]