<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 36 36"><path fill="#31373d" d="M25 24a1 1 0 0 1-1 1H12a1 1 0 0 1-1-1V12a1 1 0 0 1 1-1h12a1 1 0 0 1 1 1z"/></svg>
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This is a multicolor icon, so its colors are fixed. You can still adjust size, background, rotation, and animation.
