Only One Color But Not One Size

Riddle: Only one color, but not one size, Stuck at the bottom, yet easily flies. Present in sun, but not in rain, Doing no harm, and feeling no pain. What is it?

Answer: It's a shadow!

Source: https://www.riddles.com/1007

Only one color, but not one size, Stuck at the bottom, yet easily flies. Present in sun, but not in rain, Doing no harm, and feeling no pain. What is it? — Only one color but not one size by Anonymous v1.

Riddle: Only one color, but not one size, Stuck at the bottom, yet easily flies. Present in sun, but not in rain, Doing no harm, and feeling no pain. What is it? Answer: It's a shadow! — by Anonymous v2.