Grassy Green Pool Riddle

Puzzle of the Day 2150 : Grassy Green Pool Riddle
5 seconds Puzzle – Presence of Mind (Witty Thinker)

Riddle :

A little pool
with two layers of wall around it.
One white and soft
Other dark and hard,
amidst a light brown grassy lawn
with an outline of a green grass.

What am I?

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