RAINBOW GUI : while true do
 for a = 1,360,1 do wait(.01)
  script.Parent.BackgroundColor3 = Color3.fromHSV(a/360,1,1)
 end
end



RAINBOW TEXT : while true do
 for a = 1,360,1 do wait(.01)
  script.Parent.TextColor3 = Color3.fromHSV(a/360,1,1)
 end
end


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How to send notfiaction:
game.StarterGui:SetCore('SendNotification', {
Title = 'Titlehere';
Text = "Texthere";
Duration = 5;
   })
wait(6)
game.StarterGui:SetCore('SendNotification', {
Title = 'Title Here';
Text = "Text here";
Duration = 5;
   })



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TO MAKE THE BUTTON ACTIVATE THE SCRIPT:

BUTTONNAMEHERE.MouseButton1Down:connect(function()
Scripthere
end)

Search you're Main and make it draggable like that

YOURMAINFRAMENAME.Draggable = true


To make it open you to

NameOFBUTTON.MouseButton1Down:connect(function()
NameOFURMAINGUI.Visible = true
NAMEOFOPENFrame.Visible = false
end)

To make it close you to

CLOSEBUTTONNAME.MouseButton1Down:connect(function()
NAMEOFOPENBUTTON.Visible = true
MAINGUINAME.Visible = false
end)

Then scroll up and search for

GUINAME.Parent = game.Workspace
change Workspace to CoreGui

GUINAME.Parent = game.CoreGui

[FOR GUI IF IT'S SCRIPTED TO LUA]

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SCRIPTS :