The ornamental design for a spill-safe beverage coaster, as shown and described.
FIG. 1 is a perspective view of a spill-safe beverage coaster, showing our new design;
FIG. 2 is a top view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a side view thereof; and,
FIG. 5 is a back view thereof.
Our spill-safe beverage coaster is used to secure a beverage container, such as a mug, glass, cup, can, bottle, etc., from accidental spills, and also to provide a secure environment to safely hold said beverage container on uneven surfaces, such as a sofa, chair, bed, floor, carpet, ground, grass, etc. The shape of our spill-safe beverage coaster is inspired from a typical drone airplane. The distinct shape of a drone's four side propellers function as horizontal supports while stabilizing itself securely on the surface, so it doesn't roll over and spill the beverage.