<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 36 36"><path fill="#31373d" d="M31 15H21V5a3 3 0 1 0-6 0v10H5a3 3 0 1 0 0 6h10v10a3 3 0 1 0 6 0V21h10a3 3 0 1 0 0-6"/></svg>
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This is a multicolor icon, so its colors are fixed. You can still adjust size, background, rotation, and animation.
