How do I Change Gui Color to Custom Color?

Basically I'm working on a game where I'm making a Topbar gui, with a matching chat and teamgui. I just can't figure out how to change the color for the GUI parts for chat, as an example,

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I want the Chat gui to stay that color, but I'd have to go into studio and manually change it. Is there a line of code I can use to change that?

Path to what I want to change:

game.Players.LocalPlayer.PlayerGui.Chat.Frame.ChatBarParentFrame.Frame.BackgroundColor3