Cup Lid

FIG. 1 is a first perspective view of a cup lid according to my new design; FIG. 2 is a second perspective view thereof; FIG. 3 is a left side elevation view thereof; FIG. 4 is a right side elevation view thereof; FIG. 5 is a front elevation view thereof; FIG. 6 is a rear elevation view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; FIG. 9 is a third perspective view thereof in a first open state; and, FIG. 10 is a fourth perspective view thereof in a second open state. The broken lines depict portions of the cup lid that form no part of the claimed design.