In a bowl mix sugar and butter till fluppy and white

Add egg and Mix it will

Add flour,sugar to d mixture

Add vanilla and mix it will

Divide d mixture into 3

Add orange food color in one of d mixture and yellow color in d order one mixture and live d last mixture without color

Wipe d pan with butter

Put d plain mixture first follow by d yellow mixture and d orange mixture d process continue till d mixture finished

Dan bake it

Ur icing sugar in a bowl mix with butter and milk till it thick add any color ur want and play with ur cake with it