I claim the ornamental design for a lid for beverage container, as shown and described.
FIG. 1 is a front/left/top perspective view of the lid for beverage container showing my new design;
FIG. 2 is a rear/left/top perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a right elevational view thereof (the left elevational view is a mirror image thereof); and,
FIG. 6 is a top view thereof.
The broken lines are shown for the purpose of illustrating both parts of the article as well as environmental subject matter of an exemplary lid for beverage container. None of the broken lines form part of the claimed design.