How i make a gui color transiction smoother?

Hi i have a gui and i want to make the color change, like a rgb and i want it to change the color smoother.

https://gyazo.com/255afc4256959426d73df753e785957b

while true do

wait(2)
script.Parent.BackgroundColor3=Color3.new(1, 153/255, 102/255)
wait(2)
script.Parent.BackgroundColor3=Color3.new(0, 102/255,1)
wait(2)
script.Parent.BackgroundColor3=Color3.new(0, 153/255, 0)
wait(2)
script.Parent.BackgroundColor3=Color3.new(204/255, 0, 153/255)
wait(2)
script.Parent.BackgroundColor3=Color3.new(1, 1, 0)
wait(2)
script.Parent.BackgroundColor3=Color3.new(102/255, 51/255, 0)
wait(2)
script.Parent.BackgroundColor3=Color3.new(0, 0, 0)
wait(2)
script.Parent.BackgroundColor3=Color3.new(248/255, 248/255, 248/255)
wait(2)
script.Parent.BackgroundColor3=Color3.new(119/255, 119/255, 119/255)
wait(.5)
script.Parent.BackgroundColor3=Color3.new(102/255, 255/255, 204/255)
end

Hello. You can use TweenService to help. Try this:

local TweenService = game:GetService("TweenService")

local info = TweenInfo.new(
	4, -- Time
	Enum.EasingStyle.Sine, -- EasingStyle
	Enum.EasingDirection.Out -- EasingDirection
)

local propertyTable = {BackgroundColor3 = Color3.new(102/255, 255/255, 204/255)}

local tween = TweenService:Create(script.Parent, info, propertyTable)

tween:Play()

TweenService:Create() requires three things. The instance, TweenInfo, and propertyTable.

Please accept and upvote this answer if it helped.