The central bright fringe in a YDSE pattern with white light is white, but the immediately adjacent fringes are coloured. The colour closest to the central white fringe is:

Fringe width $\beta = \lambda D / d$ scales with wavelength. Violet has the shortest visible wavelength so the first violet fringe sits closest to the centre, while red sits farthest. The first-order maxima therefore form a small spectrum with violet on the inside and red on the outside.