Click effect

parent = script.Parent
amt = 3
coloramt = 20 -- with 20 it turns the background color whiter by 12% (as seen in video). You can change to 0 if you don't want white.

pcolorr = parent.BackgroundColor3.r
pcolorg = parent.BackgroundColor3.g
pcolorb = parent.BackgroundColor3.b
pposx = parent.Position.X.Offset
pposy = parent.Position.Y.Offset
psizex = parent.Size.X.Offset
psizey = parent.Size.Y.Offset
parent.AutoButtonColor = false

parent.MouseButton1Click:connect(function()
    parent.BackgroundColor3 = Color3.new(pcolorr + coloramt/255, pcolorg + coloramt/255, pcolorb + coloramt/255)
    parent:TweenSizeAndPosition(
        UDim2.new(0, psizex - amt * 2, 0, psizey - amt * 2),
        UDim2.new(0, pposx + amt, 0, pposy + amt),
        "Out",
        "Quad",
        0.06
    )
    wait(0.1)
    parent.BackgroundColor3 = Color3.new(pcolorr, pcolorg, pcolorb)
    parent:TweenSizeAndPosition(
        UDim2.new(0, psizex, 0, psizey),
        UDim2.new(0, pposx, 0, pposy),
        "Out",
        "Quad",
        0.06
    )
end)

wait()
parent.MouseButton1Down:connect(function()
    parent.BackgroundColor3 = Color3.new(pcolorr + coloramt/255, pcolorg + coloramt/255, pcolorb + coloramt/255)
    parent:TweenSizeAndPosition(
        UDim2.new(0, psizex - amt * 2, 0, psizey - amt * 2),
        UDim2.new(0, pposx + amt, 0, pposy + amt),
        "Out",
        "Quad",
        0.06
    )
end)

parent.MouseButton1Up:connect(function()
    parent.BackgroundColor3 = Color3.new(pcolorr, pcolorg, pcolorb)
    parent:TweenSizeAndPosition(
        UDim2.new(0, psizex, 0, psizey),
        UDim2.new(0, pposx, 0, pposy),
        "Out",
        "Quad",
        0.06
    )
end)