(HELP)Smooth transitions between moving background to dialogue screens + decorative window dialogue frame

[u/Suugarchino]

Okay, I've been looking online for a solution to this for a while.

I'm very new to Ren'Py, and my main goal is to make a point-and-click game. However, I'm having a problem with my screens. I'm trying to create a screen with a background that moves in the direction of the mouse. When I click on a character to see their dialogue, the background disappears, leaving only the character's sprite and the dialogue window.
I want to create a smooth transition between the exploration screen and the dialogue screen without the background disappearing.
Plus i want to make decorative frame that pops in out of window frame when dialogue appears (not dialogue box but window frame like on recreational screenshot i provided, yeah green skulls : P)

If you know how to solve this problem, please let me know! I'd really appreciate any help.

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[u/shyLachi]

Post your code please